What is the largest underground city in history?

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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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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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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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 the Pacific Ocean, somewhere between Guam and the Philippines, lies the Marianas Trench, also known as the Mariana Trench. At 35,814 feet below sea level, its bottom is called the Challenger Deep — the deepest point known on Earth.

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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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Çatalhöyük. Modern-day south-central Turkey was once home to one of the world's oldest cities: Çatalhöyük. It was part of an extensive civilization that flourished between 9,000 and 7,000 years ago and then suddenly disappeared.

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