World Travel Guide

Going underground: The world's best subterranean sites

This cave temple has been a pilgrimage site for 22 centuries Radon Health Mine in Boulder, Montana is said to cure ailments The Salt Cathedral of Zipaquira is 180m (590ft) underground The Cu Chi Tunnels in Vietnam are now a tourist attraction It's possible to camp on the cave's tiny 'beach' The large trampolines are suspended in mid-air The subterranean town includes hotels and a church Zip wires help visitors traverse the caverns Once an air raid shelter this subterranean space is now a cocktail bar This underground city could accommodate some 20,000 inhabitants This buried neighbourhood in Edinburgh harbours gruesome secrets The view from secret tunnels hewn into the Rock of Gibraltar We round up the world's best underground attractions The caves are illuminated by glowworms Take your love of cycling to new depths The Yucatan Peninsula is perfect for cave diving The innovative design keeps the ice rink naturally cool This war bunker sheltered Churchill and his men during the Blitz Sweden's Mine Suite is the world's deepest hotel room The Paris Catacombs hold the remains of some six million people This old salt mine is now home to an underground theme park

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