Google Knowledge Graph

knowledge base used by Google to enhance its search engine's results

Countries:

United Kingdom:

grotto - tramway tunnel - trum - tunnel network - tunnel of aggression - underground mine - underground parking facility - underground structure - underwater tunnel - zinc mine - Historic Environment Scotland - beer cellar - cave with prehistoric art - cluzeaux - crawl space - favissa - stone quarry - infernotto - rock cellar - rock-cut architecture - rock temple - sepulchral chapel - sommerkeller - subterranean waterfall - underground railway station - underground storage - Museum of the Scottish Shale Oil Industry - Wheal Martyn - shallow single-vault station - Inverness, Mackintosh Road, Emergency Planning Underground Bunker - Bailey Level Gold Mine - hydro mine - active wine cellar - adega - ancient stone quarry - blast-hole - blind shaft - burraia - cable tunnel - cavern - chalk quarry - cycling tunnel - deep underground mine - drainage tunnel - gold mine - haul road - Subterranea Britannica - inverted siphon - iron mine - lateral drift - limestone quarry - mine opening - ore mine - ort - pedestrian tunnel - prosek - refilling of shafts - road - schotterwerk - shurf - spiral tunnel