Watford Tunnels

pair of railway tunnels in Hertfordshire, England

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Watford Tunnel  site, railway tunnel, United Kingdom

Location: 51.681507, -0.419055, ///ledge.talent.uses, Google, Bing, Aerial View, OldMapsOnline, ESRI Imagery, Historic Markers, KML, NLS, OS,  eDoB, 

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{"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"auto","height":"600px","centre":{"text":"","title":"","link":"","lat":51.681507,"lon":-0.419055,"icon":""},"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":false,"defzoom":14,"layers":["OpenStreetMap","Esri.WorldImagery"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":true,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":1,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q4870554\" title=\"Q4870554\"\u003EBattle of Britain Bunker\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1939 military museum, bunker, \u003Ca rel=\"nofollow\" class=\"external text\" href=\"https://www.tripadvisor.com/3585116\"\u003Etripadvisor\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E","title":"Battle of Britain Bunker@1939 military museum, bunker, tripadvisor\n","link":"","lat":51.5412,"lon":-0.465278,"icon":"/images/d/d7/Tm_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945050\" title=\"Q124945050\"\u003EBeaconsfield Buckinghamshire County Standby Emergency Centre\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Beaconsfield Buckinghamshire County Standby Emergency Centre@ civil defense center\n","link":"","lat":51.61178,"lon":-0.645815,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945075\" title=\"Q124945075\"\u003ECamden Borough Control\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Camden Borough Control@ civil defense center\n","link":"","lat":51.556755,"lon":-0.146862,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945089\" title=\"Q124945089\"\u003EChiltern District Council Emergency Centre\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Chiltern District Council Emergency Centre@ civil defense center\n","link":"","lat":51.675173,"lon":-0.60437,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q1024854\" title=\"Q1024854\"\u003EChurchill War Rooms\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1984 national museum, biographical museum, military museum, architectural structure, bunker, \u003Ca rel=\"nofollow\" class=\"external text\" href=\"https://www.tripadvisor.com/194299\"\u003Etripadvisor\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E","title":"Churchill War Rooms@1984 national museum, biographical museum, military museum, architectural structure, bunker, tripadvisor\n","link":"","lat":51.50222,"lon":-0.1293,"icon":"/images/d/d7/Tm_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945116\" title=\"Q124945116\"\u003EEdmonton Borough Control Site 1\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Edmonton Borough Control Site 1@ civil defense center\n","link":"","lat":51.632531,"lon":-0.069603,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945118\" title=\"Q124945118\"\u003EEdmonton Borough Control Site 2\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Edmonton Borough Control Site 2@ civil defense center\n","link":"","lat":51.622503,"lon":-0.06136,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945134\" title=\"Q124945134\"\u003EFinchley Borough Control\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Finchley Borough Control@ civil defense center\n","link":"","lat":51.596947,"lon":-0.195673,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945136\" title=\"Q124945136\"\u003EFinsbury Borough Control\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Finsbury Borough Control@ civil defense center\n","link":"","lat":51.527079,"lon":-0.107996,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q26529162\" title=\"Q26529162\"\u003EHackney Air Raid Precaution Centre\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Eair-raid shelter\n\u003C/p\u003E\u003C/div\u003E","title":"Hackney Air Raid Precaution Centre@ air-raid shelter\n","link":"","lat":51.563222,"lon":-0.059901,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945149\" title=\"Q124945149\"\u003EHackney WW2 ARP Control and Post War Borough Control\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Hackney WW2 ARP Control and Post War Borough Control@ civil defense center\n","link":"","lat":51.54559,"lon":-0.056735,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945155\" title=\"Q124945155\"\u003EHayes Sub Area Control\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Hayes Sub Area Control@ civil defense center\n","link":"","lat":51.495326,"lon":-0.431921,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945157\" title=\"Q124945157\"\u003EHemel Hempstead Dacorum Borough Council Emergency Centre\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Hemel Hempstead Dacorum Borough Council Emergency Centre@ civil defense center\n","link":"","lat":51.755067,"lon":-0.473587,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124837838\" title=\"Q124837838\"\u003EHertford bunker\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ebunker\n\u003C/p\u003E\u003C/div\u003E","title":"Hertford bunker@ bunker\n","link":"","lat":51.793666,"lon":-0.080131,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945159\" title=\"Q124945159\"\u003EHillingdon Borough Control\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Hillingdon Borough Control@ civil defense center\n","link":"","lat":51.544026,"lon":-0.476071,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945186\" title=\"Q124945186\"\u003ELuton County Borough Control\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Luton County Borough Control@ civil defense center\n","link":"","lat":51.876046,"lon":-0.419476,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945194\" title=\"Q124945194\"\u003EMiddlesex County Control\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Middlesex County Control@ civil defense center\n","link":"","lat":51.6108,"lon":-0.355048,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945196\" title=\"Q124945196\"\u003EMill Hill North West London Group Control\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Mill Hill North West London Group Control@ civil defense center\n","link":"","lat":51.615898,"lon":-0.207545,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945199\" title=\"Q124945199\"\u003ENortholt Sub Control\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Northolt Sub Control@ civil defense center\n","link":"","lat":51.541716,"lon":-0.366193,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q7115612\" title=\"Q7115612\"\u003EOxgate Admiralty Citadel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ebunker\n\u003C/p\u003E\u003C/div\u003E","title":"Oxgate Admiralty Citadel@ bunker\n","link":"","lat":51.5681,"lon":-0.2297,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945207\" title=\"Q124945207\"\u003EPaddington Borough Control\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Paddington Borough Control@ civil defense center\n","link":"","lat":51.520626,"lon":-0.173942,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q7123359\" title=\"Q7123359\"\u003EPaddock\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ebunker\n\u003C/p\u003E\u003C/div\u003E","title":"Paddock@ bunker\n","link":"","lat":51.5622,"lon":-0.238586,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945219\" title=\"Q124945219\"\u003ERichmond Borough Emergency Centre\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Richmond Borough Emergency Centre@ civil defense center\n","link":"","lat":51.463693,"lon":-0.300579,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945232\" title=\"Q124945232\"\u003ESouthall London North West Group War HQ\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Southall London North West Group War HQ@ civil defense center\n","link":"","lat":51.508422,"lon":-0.378127,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945244\" title=\"Q124945244\"\u003ESt Albans City and District Council Emergency Centre\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"St Albans City and District Council Emergency Centre@ civil defense center\n","link":"","lat":51.753344,"lon":-0.336082,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q27087363\" title=\"Q27087363\"\u003ESt Leonard's Court Air Raid Shelter\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Eair-raid shelter\n\u003C/p\u003E\u003C/div\u003E","title":"St Leonard's Court Air Raid Shelter@ air-raid shelter\n","link":"","lat":51.46726,"lon":-0.269484,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q27062788\" title=\"Q27062788\"\u003ESt Leonard's Court\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1938 revenue house, air-raid shelter\n\u003C/p\u003E\u003C/div\u003E","title":"St Leonard's Court@1938 revenue house, air-raid shelter\n","link":"","lat":51.4674,"lon":-0.2695,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945256\" title=\"Q124945256\"\u003EStoke Newington Borough Control and Hackney Borough Control 2nd Site\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Stoke Newington Borough Control and Hackney Borough Control 2nd Site@ civil defense center\n","link":"","lat":51.561698,"lon":-0.083615,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945254\" title=\"Q124945254\"\u003EStoke Newington Borough Control\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Stoke Newington Borough Control@ civil defense center\n","link":"","lat":51.561698,"lon":-0.083615,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945249\" title=\"Q124945249\"\u003ESt Pancras Borough Control\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"St Pancras Borough Control@ civil defense center\n","link":"","lat":51.556755,"lon":-0.146862,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124945269\" title=\"Q124945269\"\u003ETottenham Borough Control\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecivil defense center\n\u003C/p\u003E\u003C/div\u003E","title":"Tottenham Borough Control@ civil defense center\n","link":"","lat":51.58706,"lon":-0.072682,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124823106\" title=\"Q124823106\"\u003EUxbridge Anti-Aircraft Operations Room\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ebunker\n\u003C/p\u003E\u003C/div\u003E","title":"Uxbridge Anti-Aircraft Operations Room@ bunker\n","link":"","lat":51.5463512,"lon":-0.4618435,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124858342\" title=\"Q124858342\"\u003EWatford Royal Observer Corps Group Headquarters\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ebunker\n\u003C/p\u003E\u003C/div\u003E","title":"Watford Royal Observer Corps Group Headquarters@ bunker\n","link":"","lat":51.668045,"lon":-0.418656,"icon":"/images/6/6e/M_bunker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q26469214\" title=\"Q26469214\"\u003EGrotto About 70 Metres North East Of Dancers Hill House\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Egrotto\n\u003C/p\u003E\u003C/div\u003E","title":"Grotto About 70 Metres North East Of Dancers Hill House@ grotto\n","link":"","lat":51.679942,"lon":-0.214551,"icon":"/images/4/48/M_cave.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q26617215\" title=\"Q26617215\"\u003EGrotto At Dropmore\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Egrotto\n\u003C/p\u003E\u003C/div\u003E","title":"Grotto At Dropmore@ grotto\n","link":"","lat":51.565267,"lon":-0.666141,"icon":"/images/4/48/M_cave.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q17553459\" title=\"Q17553459\"\u003EGrotto Or Shell House In The Grounds Of Thames Eyot\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Egrotto\n\u003C/p\u003E\u003C/div\u003E","title":"Grotto Or Shell House In The Grounds Of Thames Eyot@ grotto\n","link":"","lat":51.4436,"lon":-0.329907,"icon":"/images/4/48/M_cave.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q5707475\" title=\"Q5707475\"\u003EHellfire Caves\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Eshow cave, fixed construction, \u003Ca rel=\"nofollow\" class=\"external text\" href=\"https://www.tripadvisor.com/2277486\"\u003Etripadvisor\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E","title":"Hellfire Caves@ show cave, fixed construction, tripadvisor\n","link":"","lat":51.646,"lon":-0.8026,"icon":"/images/0/0a/Tm_cave.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q99646075\" title=\"Q99646075\"\u003EPope's Grotto in Grounds of St Catherine's High School\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Egrotto\n\u003C/p\u003E\u003C/div\u003E","title":"Pope's Grotto in Grounds of St Catherine's High School@ grotto\n","link":"","lat":51.44134,"lon":-0.333,"icon":"/images/4/48/M_cave.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q7435823\" title=\"Q7435823\"\u003EScott's Grotto\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Eshell grotto\n\u003C/p\u003E\u003C/div\u003E","title":"Scott's Grotto@ shell grotto\n","link":"","lat":51.80667,"lon":-0.03333,"icon":"/images/4/48/M_cave.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q5050176\" title=\"Q5050176\"\u003ECastle Lime Works Quarry\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Equarry\n\u003C/p\u003E\u003C/div\u003E","title":"Castle Lime Works Quarry@ quarry\n","link":"","lat":51.7087,"lon":-0.22268,"icon":"/images/a/ab/M_mine.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q5656799\" title=\"Q5656799\"\u003EHarefield Pit\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Echalk quarry\n\u003C/p\u003E\u003C/div\u003E","title":"Harefield Pit@ chalk quarry\n","link":"","lat":51.598,"lon":-0.486,"icon":"/images/a/ab/M_mine.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q20711582\" title=\"Q20711582\"\u003EHill End Pit\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Echalk quarry\n\u003C/p\u003E\u003C/div\u003E","title":"Hill End Pit@ chalk quarry\n","link":"","lat":51.9008,"lon":-0.26017,"icon":"/images/a/ab/M_mine.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q20979086\" title=\"Q20979086\"\u003EKensworth Chalk Pit\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Echalk quarry\n\u003C/p\u003E\u003C/div\u003E","title":"Kensworth Chalk Pit@ chalk quarry\n","link":"","lat":51.866,"lon":-0.517,"icon":"/images/a/ab/M_mine.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q20740388\" title=\"Q20740388\"\u003EMoor Mill Quarry, West\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Equarry\n\u003C/p\u003E\u003C/div\u003E","title":"Moor Mill Quarry, West@ quarry\n","link":"","lat":51.711814,"lon":-0.3505767,"icon":"/images/a/ab/M_mine.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q22004821\" title=\"Q22004821\"\u003EPitstone Quarry\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Equarry\n\u003C/p\u003E\u003C/div\u003E","title":"Pitstone Quarry@ quarry\n","link":"","lat":51.820887,"lon":-0.647028,"icon":"/images/a/ab/M_mine.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q20979107\" title=\"Q20979107\"\u003ESundon Chalk Quarry\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Equarry\n\u003C/p\u003E\u003C/div\u003E","title":"Sundon Chalk Quarry@ quarry\n","link":"","lat":51.936758,"lon":-0.48935,"icon":"/images/a/ab/M_mine.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q24662498\" title=\"Q24662498\"\u003ESundon Quarry\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Equarry\n\u003C/p\u003E\u003C/div\u003E","title":"Sundon Quarry@ quarry\n","link":"","lat":51.93672,"lon":-0.49258,"icon":"/images/a/ab/M_mine.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q20979111\" title=\"Q20979111\"\u003ETotternhoe Chalk Quarry\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Equarry\n\u003C/p\u003E\u003C/div\u003E","title":"Totternhoe Chalk Quarry@ quarry\n","link":"","lat":51.891883,"lon":-0.567876,"icon":"/images/a/ab/M_mine.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q29019788\" title=\"Q29019788\"\u003EWraysbury and Hythe End Gravel Pits\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Egravel pit\n\u003C/p\u003E\u003C/div\u003E","title":"Wraysbury and Hythe End Gravel Pits@ gravel pit\n","link":"","lat":51.451,"lon":-0.545,"icon":"/images/a/ab/M_mine.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q107384630\" title=\"Q107384630\"\u003EBakerloo line tunnels\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1906 railway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Bakerloo line tunnels@1906 railway tunnel\n","link":"","lat":51.505555555,"lon":-0.120555555,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q107383533\" title=\"Q107383533\"\u003EBankside Cable Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1940 utility tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Bankside Cable Tunnel@1940 utility tunnel\n","link":"","lat":51.509722222,"lon":-0.098888888,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q107434822\" title=\"Q107434822\"\u003EBankside\u2013Charing Cross cable tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Eutility tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Bankside\u2013Charing Cross cable tunnel@ utility tunnel\n","link":"","lat":51.506111111,"lon":-0.120277777,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q24885278\" title=\"Q24885278\"\u003EBarnet Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Erailway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Barnet Tunnel@ railway tunnel\n","link":"","lat":51.6295,"lon":-0.1582,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q107385720\" title=\"Q107385720\"\u003EBattersea exhaust tunnels\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1920 utility tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Battersea exhaust tunnels@1920 utility tunnel\n","link":"","lat":51.483888888,"lon":-0.146666666,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q107385520\" title=\"Q107385520\"\u003EBattersea steam tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E2000 utility tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Battersea steam tunnel@2000 utility tunnel\n","link":"","lat":51.484166666,"lon":-0.141944444,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q85750414\" title=\"Q85750414\"\u003ECanal Tunnels\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Erailway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Canal Tunnels@ railway tunnel\n","link":"","lat":51.538615,"lon":-0.1261667,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q107383362\" title=\"Q107383362\"\u003ECity \u0026amp; South London Railway tunnels\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1890 railway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"City \u0026amp; South London Railway tunnels@1890 railway tunnel\n","link":"","lat":51.508055555,"lon":-0.088888888,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q18737013\" title=\"Q18737013\"\u003ECopenhagen Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1850 railway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Copenhagen Tunnel@1850 railway tunnel\n","link":"","lat":51.5456,"lon":-0.120632,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q5187664\" title=\"Q5187664\"\u003ECromwell Curve\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Etunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Cromwell Curve@ tunnel\n","link":"","lat":51.4955,"lon":-0.1873,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q84557580\" title=\"Q84557580\"\u003EElstree to St. John's Wood Cable Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Epower cable, tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Elstree to St. John's Wood Cable Tunnel@ power cable, tunnel\n","link":"","lat":51.526,"lon":-0.172,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q108336750\" title=\"Q108336750\"\u003EEuston tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Etunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Euston tunnel@ tunnel\n","link":"","lat":51.537,"lon":-0.192,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q2042810\" title=\"Q2042810\"\u003EEyre's Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1816 canal tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Eyre's Tunnel@1816 canal tunnel\n","link":"","lat":51.526389,"lon":-0.171667,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q96308186\" title=\"Q96308186\"\u003EGasworks Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Erailway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Gasworks Tunnel@ railway tunnel\n","link":"","lat":51.535305555,"lon":-0.123305555,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q5552502\" title=\"Q5552502\"\u003EGerrards Cross Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Erailway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Gerrards Cross Tunnel@ railway tunnel\n","link":"","lat":51.588343,"lon":-0.553007,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q116702014\" title=\"Q116702014\"\u003EHadley Wood North Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Erailway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Hadley Wood North Tunnel@ railway tunnel\n","link":"","lat":51.6720744,"lon":-0.1763445,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q116702013\" title=\"Q116702013\"\u003EHadley Wood South Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Erailway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Hadley Wood South Tunnel@ railway tunnel\n","link":"","lat":51.6659153,"lon":-0.1759713,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q5694325\" title=\"Q5694325\"\u003EHeathrow Airside Road Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Etunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Heathrow Airside Road Tunnel@ tunnel\n","link":"","lat":51.4683,"lon":-0.49059,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q15223451\" title=\"Q15223451\"\u003EHeathrow Cargo Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Eroad tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Heathrow Cargo Tunnel@ road tunnel\n","link":"","lat":51.464,"lon":-0.456,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q122212349\" title=\"Q122212349\"\u003EHighgate East Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Erailway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Highgate East Tunnel@ railway tunnel\n","link":"","lat":51.5768302,"lon":-0.1437943,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q1947073\" title=\"Q1947073\"\u003EIslington Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1818 canal tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Islington Tunnel@1818 canal tunnel\n","link":"","lat":51.534167,"lon":-0.108611,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q107384854\" title=\"Q107384854\"\u003EJubilee Line Extension tunnels\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1999 railway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Jubilee Line Extension tunnels@1999 railway tunnel\n","link":"","lat":51.501111111,"lon":-0.121666666,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q121677764\" title=\"Q121677764\"\u003EKing\u2019s Cross Light Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E2016 pedestrian tunnel, subway tunnel, installation art\n\u003C/p\u003E\u003C/div\u003E","title":"King\u2019s Cross Light Tunnel@2016 pedestrian tunnel, subway tunnel, installation art\n","link":"","lat":51.533099,"lon":-0.124964,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q12061013\" title=\"Q12061013\"\u003EKingsway tramway subway\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Etramway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Kingsway tramway subway@ tramway tunnel\n","link":"","lat":51.518361111,"lon":-0.120777777,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q2913985\" title=\"Q2913985\"\u003EMaida Hill Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ecanal tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Maida Hill Tunnel@ canal tunnel\n","link":"","lat":51.525278,"lon":-0.175833,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q116702051\" title=\"Q116702051\"\u003ENorthchurch Tunnels\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Erailway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Northchurch Tunnels@ railway tunnel\n","link":"","lat":51.7712793,"lon":-0.5851313,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q107383178\" title=\"Q107383178\"\u003ENorthern Line (Bank branch) tunnels\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1900 railway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Northern Line (Bank branch) tunnels@1900 railway tunnel\n","link":"","lat":51.507777777,"lon":-0.086944444,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q107383840\" title=\"Q107383840\"\u003ENorthern line (Charing Cross branch) tunnels\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1926 railway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Northern line (Charing Cross branch) tunnels@1926 railway tunnel\n","link":"","lat":51.506388888,"lon":-0.119444444,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q107564527\" title=\"Q107564527\"\u003ENortholt tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ehigh-speed railway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Northolt tunnel@ high-speed railway tunnel\n","link":"","lat":51.536,"lon":-0.319,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q116701855\" title=\"Q116701855\"\u003EPonsbourne Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Erailway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Ponsbourne Tunnel@ railway tunnel\n","link":"","lat":51.7416783,"lon":-0.1008099,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q27082177\" title=\"Q27082177\"\u003EPrimrose Hill Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1838 railway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Primrose Hill Tunnel@1838 railway tunnel\n","link":"","lat":51.542,"lon":-0.169,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q2296005\" title=\"Q2296005\"\u003ESnow Hill Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Erailway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Snow Hill Tunnel@ railway tunnel\n","link":"","lat":51.513055555,"lon":-0.103611111,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q27087169\" title=\"Q27087169\"\u003ESouth Kensington Subway\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Epedestrian tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"South Kensington Subway@ pedestrian tunnel\n","link":"","lat":51.494452,"lon":-0.173732,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q7621257\" title=\"Q7621257\"\u003EStrand Underpass\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Eroad tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Strand Underpass@ road tunnel\n","link":"","lat":51.516583333,"lon":-0.118861111,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q7709949\" title=\"Q7709949\"\u003EThames Water Ring Main\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Ewater pipe, tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Thames Water Ring Main@ water pipe, tunnel\n","link":"","lat":51.4125,"lon":-0.45,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q97324807\" title=\"Q97324807\"\u003EThe Nursemaids' Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Esubway\n\u003C/p\u003E\u003C/div\u003E","title":"The Nursemaids' Tunnel@ subway\n","link":"","lat":51.52365,"lon":-0.1462,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q107385171\" title=\"Q107385171\"\u003EVictoria line tunnels\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1971 railway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Victoria line tunnels@1971 railway tunnel\n","link":"","lat":51.487222222,"lon":-0.1275,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q7974311\" title=\"Q7974311\"\u003EWaterloo and Whitehall Railway\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Eproposed building or structure, tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Waterloo and Whitehall Railway@ proposed building or structure, tunnel\n","link":"","lat":51.506041666,"lon":-0.126633333,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q207699\" title=\"Q207699\"\u003EWaterloo \u0026amp; City line\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Erapid transit railway line, subway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Waterloo \u0026amp; City line@ rapid transit railway line, subway tunnel\n","link":"","lat":51.513056,"lon":-0.088056,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q107383624\" title=\"Q107383624\"\u003EWaterloo \u0026amp; City line tunnels\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1898 railway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Waterloo \u0026amp; City line tunnels@1898 railway tunnel\n","link":"","lat":51.509722222,"lon":-0.105555555,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124414239\" title=\"Q124414239\"\u003EWatford East Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1874 railway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Watford East Tunnel@1874 railway tunnel\n","link":"","lat":51.681784,"lon":-0.41802,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca class=\"mw-selflink selflink\"\u003EWatford Tunnels\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Erailway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Watford Tunnels@ railway tunnel\n","link":"","lat":51.681507,"lon":-0.419055,"icon":"/images/d/d2/Red-marker.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q124414230\" title=\"Q124414230\"\u003EWatford West Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1837 railway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Watford West Tunnel@1837 railway tunnel\n","link":"","lat":51.681507,"lon":-0.419055,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q116701682\" title=\"Q116701682\"\u003EWelwyn North Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Erailway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Welwyn North Tunnel@ railway tunnel\n","link":"","lat":51.8368562,"lon":-0.1853459,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q116689751\" title=\"Q116689751\"\u003EWelwyn South Tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Erailway tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Welwyn South Tunnel@ railway tunnel\n","link":"","lat":51.8277899,"lon":-0.1900868,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q26503164\" title=\"Q26503164\"\u003EWest Portal And Islington Tunnel (Regents Canal)\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003Eportal, tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"West Portal And Islington Tunnel (Regents Canal)@ portal, tunnel\n","link":"","lat":51.534805,"lon":-0.115022,"icon":"/images/0/04/M_tunnel.png"},{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca href=\"/Q107385393\" title=\"Q107385393\"\u003EWimbledon \u2013 Pimlico cable tunnel\u003C/a\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E1996 utility tunnel\n\u003C/p\u003E\u003C/div\u003E","title":"Wimbledon \u2013 Pimlico cable tunnel@1996 utility tunnel\n","link":"","lat":51.486111111,"lon":-0.128333333,"icon":"/images/0/04/M_tunnel.png"}],"imageoverlays":null}

---

• All subterranean sites

---

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Frameless

Cutting southern end of the Watford Tunnel 2010

Cutting south of Watford Tunnel 2015

Leavesden exit, A405 2012

Ventilation shaft, Courtlands Drive 2013

Ventilation Shaft for Watford North Rail Tunnel - geograph.org.uk - 1591368 2007

Watford Railway Tunnel - geograph.org.uk - 1761031 2010

Type	Date	Description	Keywords	Notes	Source
site	1939	Battle of Britain Bunker	military museum, bunker, tripadvisor		Wikidata
site		Beaconsfield Buckinghamshire County Standby Emergency Centre	civil defense center		Wikidata
site		Camden Borough Control	civil defense center		Wikidata
site		Chiltern District Council Emergency Centre	civil defense center		Wikidata
site	1984	Churchill War Rooms	national museum, biographical museum, military museum, architectural structure, bunker, tripadvisor		Wikidata
site		Edmonton Borough Control Site 1	civil defense center		Wikidata
site		Edmonton Borough Control Site 2	civil defense center		Wikidata
site		Finchley Borough Control	civil defense center		Wikidata
site		Finsbury Borough Control	civil defense center		Wikidata
site		Hackney Air Raid Precaution Centre	air-raid shelter		Wikidata
site		Hackney WW2 ARP Control and Post War Borough Control	civil defense center		Wikidata
site		Hayes Sub Area Control	civil defense center		Wikidata
site		Hemel Hempstead Dacorum Borough Council Emergency Centre	civil defense center		Wikidata
site		Hertford bunker	bunker		Wikidata
site		Hillingdon Borough Control	civil defense center		Wikidata
site		Luton County Borough Control	civil defense center		Wikidata
site		Middlesex County Control	civil defense center		Wikidata
site		Mill Hill North West London Group Control	civil defense center		Wikidata
site		Northolt Sub Control	civil defense center		Wikidata
site		Oxgate Admiralty Citadel	bunker		Wikidata
site		Paddington Borough Control	civil defense center		Wikidata
site		Paddock	bunker		Wikidata
site		Richmond Borough Emergency Centre	civil defense center		Wikidata
site		Southall London North West Group War HQ	civil defense center		Wikidata
site		St Albans City and District Council Emergency Centre	civil defense center		Wikidata
site		St Leonard's Court Air Raid Shelter	air-raid shelter		Wikidata
site	1938	St Leonard's Court	revenue house, air-raid shelter		Wikidata
site		Stoke Newington Borough Control and Hackney Borough Control 2nd Site	civil defense center		Wikidata
site		Stoke Newington Borough Control	civil defense center		Wikidata
site		St Pancras Borough Control	civil defense center		Wikidata
site		Tottenham Borough Control	civil defense center		Wikidata
site		Uxbridge Anti-Aircraft Operations Room	bunker		Wikidata
site		Watford Royal Observer Corps Group Headquarters	bunker		Wikidata
site		Grotto About 70 Metres North East Of Dancers Hill House	grotto		Wikidata
site		Grotto At Dropmore	grotto		Wikidata
site		Grotto Or Shell House In The Grounds Of Thames Eyot	grotto		Wikidata
site		Hellfire Caves	show cave, fixed construction, tripadvisor		Wikidata
site		Pope's Grotto in Grounds of St Catherine's High School	grotto		Wikidata
site		Scott's Grotto	shell grotto		Wikidata
site		Castle Lime Works Quarry	quarry		Wikidata
site		Harefield Pit	chalk quarry		Wikidata
site		Hill End Pit	chalk quarry		Wikidata
site		Kensworth Chalk Pit	chalk quarry		Wikidata
site		Moor Mill Quarry, West	quarry		Wikidata
site		Pitstone Quarry	quarry		Wikidata
site		Sundon Chalk Quarry	quarry		Wikidata
site		Sundon Quarry	quarry		Wikidata
site		Totternhoe Chalk Quarry	quarry		Wikidata
site		Wraysbury and Hythe End Gravel Pits	gravel pit		Wikidata
site	1906	Bakerloo line tunnels	railway tunnel		Wikidata
site	1940	Bankside Cable Tunnel	utility tunnel		Wikidata
site		Bankside–Charing Cross cable tunnel	utility tunnel		Wikidata
site		Barnet Tunnel	railway tunnel		Wikidata
site	1920	Battersea exhaust tunnels	utility tunnel		Wikidata
site	2000	Battersea steam tunnel	utility tunnel		Wikidata
site		Canal Tunnels	railway tunnel		Wikidata
site	1890	City & South London Railway tunnels	railway tunnel		Wikidata
site	1850	Copenhagen Tunnel	railway tunnel		Wikidata
site		Cromwell Curve	tunnel		Wikidata
site		Elstree to St. John's Wood Cable Tunnel	power cable, tunnel		Wikidata
site		Euston tunnel	tunnel		Wikidata
site	1816	Eyre's Tunnel	canal tunnel		Wikidata
site		Gasworks Tunnel	railway tunnel		Wikidata
site		Gerrards Cross Tunnel	railway tunnel		Wikidata
site		Hadley Wood North Tunnel	railway tunnel		Wikidata
site		Hadley Wood South Tunnel	railway tunnel		Wikidata
site		Heathrow Airside Road Tunnel	tunnel		Wikidata
site		Heathrow Cargo Tunnel	road tunnel		Wikidata
site		Highgate East Tunnel	railway tunnel		Wikidata
site	1818	Islington Tunnel	canal tunnel		Wikidata
site	1999	Jubilee Line Extension tunnels	railway tunnel		Wikidata
site	2016	King’s Cross Light Tunnel	pedestrian tunnel, subway tunnel, installation art		Wikidata
site		Kingsway tramway subway	tramway tunnel		Wikidata
site		Maida Hill Tunnel	canal tunnel		Wikidata
site		Northchurch Tunnels	railway tunnel		Wikidata
site	1900	Northern Line (Bank branch) tunnels	railway tunnel		Wikidata
site	1926	Northern line (Charing Cross branch) tunnels	railway tunnel		Wikidata
site		Northolt tunnel	high-speed railway tunnel		Wikidata
site		Ponsbourne Tunnel	railway tunnel		Wikidata
site	1838	Primrose Hill Tunnel	railway tunnel		Wikidata
site		Snow Hill Tunnel	railway tunnel		Wikidata
site		South Kensington Subway	pedestrian tunnel		Wikidata
site		Strand Underpass	road tunnel		Wikidata
site		Thames Water Ring Main	water pipe, tunnel		Wikidata
site		The Nursemaids' Tunnel	subway		Wikidata
site	1971	Victoria line tunnels	railway tunnel		Wikidata
site		Waterloo and Whitehall Railway	proposed building or structure, tunnel		Wikidata
site		Waterloo & City line	rapid transit railway line, subway tunnel		Wikidata
site	1898	Waterloo & City line tunnels	railway tunnel		Wikidata
site	1874	Watford East Tunnel	railway tunnel		Wikidata
site		Watford Tunnels	railway tunnel		Wikidata
site	1837	Watford West Tunnel	railway tunnel		Wikidata
site		Welwyn North Tunnel	railway tunnel		Wikidata
site		Welwyn South Tunnel	railway tunnel		Wikidata
site		West Portal And Islington Tunnel (Regents Canal)	portal, tunnel		Wikidata
site	1996	Wimbledon – Pimlico cable tunnel	utility tunnel		Wikidata
image	2010	Cutting southern end of the Watford Tunnel			Wikimedia
image	2015	Cutting south of Watford Tunnel			Wikimedia
image	2012	Leavesden exit, A405			Wikimedia
image	2013	Ventilation shaft, Courtlands Drive			Wikimedia
image	2007	Ventilation Shaft for Watford North Rail Tunnel - geograph.org.uk - 1591368			Wikimedia
image	2010	Watford Railway Tunnel - geograph.org.uk - 1761031			Wikimedia