Freebase

online knowledge base (2007-2016)

Countries:

United Kingdom:

subterranea - National Coal Mining Museum for England - Churchill War Rooms - Hack Green Secret Nuclear Bunker - zemlyanka - yagura - wine cave - volcanic pipe - underground lake - underground city - underground base - undercroft - sump - Peak District Mining Museum - subterranean river - storm cellar - solutional cave - sod house - shell grotto - shallow column station - sea cave - rock-cut architecture - rock-cut architecture in India - ratskeller - pylon station - South Wales Miners' Museum - British Tunnelling Society - Paddock - Oxgate Admiralty Citadel - Goldsland - Fort Henry - Clogau Gold Mine - Barnton Quarry - Dolaucothi Gold Mines - Zindan - Descent - Dover Castle - Sygun Copper Mine - Prince Charlies cave - National Mining Museum Scotland - Kelvedon Hatch Secret Nuclear Bunker - Haig Colliery Mining Museum - Clifford Road Air Raid Shelter - Cefn Coed Colliery Museum - Big Pit National Coal Museum - Battle of Britain Bunker - Geevor Tin Mine - National Slate Museum - Levant Mine and Beam Engine - Purbeck Mineral and Mining Museum - gravel pit - wine room - water tunnel - utility tunnel - undersea tunnel - souterrain - sough - slope mining - root cellar - penstock - nickel mine - mine shaft - immersed tube - Cadw - fogou - flint mine - engine-shaft - denehole - deep borehole disposal - clay pit - chultun - catacombs - canal tunnel - borehole - bell pit - deep geological repository - pit-house - missile launch facility - lunar lava tube - lava tube - hypogeum - grotto - ghost station - erdstall tunnel - dungeon - dugout - diatreme - deep single-vault station - adit - deep column station - chandrashala - cellarium - casemate - burial vault - burdei - basement - aljibe - National Trust - Historic England - English Heritage