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Underground attractions: caves, tunnels, catacombs, Cold War bunkers – 7 of the world’s best subterranean sights
the Paris Catacombs and the world's largest cave, in central Vietnam Some of us find them cramped, others happily spend hours exploring them. Some were places of work, others places of death.
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Discover 5 U.S. Cities With Secret Undergrounds
The Indianapolis Catacombs comprises 20,000 square feet of ... A massive business complex carved into an artificial cave ...
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Humans have dug much deeper than you would expect
The Paris Catacombs are 65 feet underground ... The deepest known point in a cave is in Krubera Cave in Georgia. Switzerland's Gotthard Base Tunnel is the deepest railway tunnel.