Cu Chi Tunnels – Vietnam, Seattle Underground – USA, Edinburgh Vaults – Scotland, Naours Underground City – France, Postojna Cave – Slovenia, Montreal Underground City (RÉSO) – Canada, Shanghai Tunnels – USA, Basilica Cistern – Turkey, Naples Underground (Napoli Sotterranea) – Italy, Orvieto Underground – Italy, Setenil de las Bodegas Cave Houses – Spain, Reed Flute Cave – China, Skocjan Caves – Slovenia, Actun Tunichil Muknal – Belize, Petralona Cave – Greece, Batu Caves – Malaysia, Churchill War Rooms – United Kingdom, Underground City of Beijing (Dixia Cheng) – China

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