Do secret cities exist?

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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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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Derinkuyu (also known as Elengubu, Cappadocian Greek: ?a?a??p? Malakopi; Turkish: Derinkuyu Yeralti Sehri) is an ancient multi-level underground city near the modern town of Derinkuyu in Nevsehir Province, Turkey, extending to a depth of approximately 85 metres (280 ft).

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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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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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Subterranean London refers to a number of subterranean structures that lie beneath London. The city has been occupied by humans for two millennia. Over time, the capital has acquired a vast number of these structures and spaces, often as a result of war and conflict.

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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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Well, at the moment, Çatalhöyük is the first known city in the world – the first place where surrounding villages came together and formed a central location and began the sort of urban civilization that dominates the modern world.

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At 402 kilometres in length, the London Underground is also the world's second-longest metro system while 434 kilometres Shanghai Metro in China is the longest to date.

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It is easier and safer to dig at depth in London because of the nature of the soil and to avoid other infrastructure and the Thames. It also may result from the fact that London is quite hilly and trains don't like going up hills, so the tube goes through the hill.

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