What is the largest underground city in the United States?

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, Cappadocia, Turkey 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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The ancient city of Elengubu, known today as Derinkuyu, burrows more than 85m below the Earth's surface, encompassing 18 levels of tunnels.

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Turkey's Cappadocia region contains hundreds of underground cities. Derinkuyu happens to be the deepest and most intricate. It is capable of hiding 20,000 people within the tunnels and chambers carved out of volcanic rock. On the outside, the entrance looks almost completely hidden and easily missed.

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The Shanghai Metro is the world's longest metro network at 803 kilometres (499 mi) and has the highest annual ridership at 2.83 billion trips. The New York City Subway has the greatest number of stations with 472. As of 2023, the country with the most metro systems is China, with 45 in operation.

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The New York Subway has more stations than the London Underground. Both systems have almost the same route miles. The New York Subway has more track miles because many routes have four tracks rather than the London Underground's two tracks.

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The world's first underground railway opened in London in 1863, as a way of reducing street congestion.

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