Are there any secret cities?

Derinkuyu, Cappadocia, Turkey | Underground cities Due to this, the once-secret underground city is a self-sufficient metropolis inhabiting ventilation shafts, wells, kitchens, schoolrooms, oil presses, a bathhouse, a winery and living space for some 20,000 people in 18 storeys.



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Some cities are so top-secret they can't even be found on a map. Others are padlocked, hidden in the forest, or buried deep underground. From Poland's 800-year-old Wieliczka Salt Mines to America's WWII mystery towns, SPYSCAPE explores some of the world's most intriguing secret cities.

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The largest underground city in the United States is the SubTropolis, which is an artificial cave located just above the Missouri River in Kansas City, Missouri. This underground city is 5,100,000 square meters and sits on a 1,100-acre piece of land with limestone deposits dating back to 270 million years ago.

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SubTropolis is a 55,000,000-square-foot (5,100,000 m2), 1,100-acre (4.5 km2) artificial cave in the bluffs above the Missouri River in Kansas City, Missouri, United States, that is claimed to be the world's largest underground storage facility.

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Derinkuyu – located in the heart of Cappadocia – was built to meet all the needs of the people who lived there, moving their daily lives underground, from children to animals. The city is 85 meters deep and stretches for kilometers, with tunnels connecting it to other Turkish cities.

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There have been homeless people living underground in New York City for decades. This practice began around the time of the Great Depression.

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Cappadocia city, located in central Turkey, is home to no less than 36 underground cities, and at a depth of approx. 85 m, Derinkuyu is the deepest.

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Breathing regular air on Earth, humans can deal with about 8 times sea level pressure before taking harm, which would be at a depth of about 20 km.

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In 1998, TriMet built the Washington Park MAX Station, which is the deepest transit station in North America at 260 feet below ground, as part of our Red Line. “Washington Park also is the only underground station in the entire MAX system.”

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