Derinkuyu, Turkey - This is one of the largest underground cities in the world, with a network of tunnels and chambers that go down to a depth of over 200 feet.
Wieliczka Salt Mine, Poland - The Wieliczka Salt Mine is an underground city that was built in the 13th century. It contains a chapel, a restaurant, and even a hotel.
Beijing Underground City, China - This is a network of tunnels and bunkers that were built during the Cold War to protect the Chinese government from nuclear attacks.
Montreal Underground City, Canada - This is the largest underground city in the world, with over 20 miles of tunnels and 4 million square feet of space.
Tunnels of Moose Jaw, Moose Jaw, CanadaThe sleepy city of Moose Jaw, located in the state of Saskatchewan in Southern Canada, is home to a series of tunnels that have two separate stories.
Coober Pedy, Australia - This is an underground town that was built in the middle of the Australian outback. It was built by opal miners who wanted to escape the harsh desert climate.
Orvieto, Italy - A walk through the subterranean passages in this Italian town, better known for its white wine, reveals interesting snippets from the lives of the ancient Etruscans.
Setenil de las Bodegas, Spain - Unlike some of the other places on this list, Setenil de las Bodegas, a pueblo (small town) in Southern Spain.
Pilsen Historical Underground, Czech Republic -The city of Pilsen, in the western part of the country, is home to Pilsen Historical Underground, a 12.5 mile long labyrinth of passageways.
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