Kaymakli underground city 9003 Nevit Enhancer - image by Nevit Dilmen, via WikipediaThe cities of Özkonak, Derinkuyu, and Kaymaklı in Cappadocia, Turkey, are some of the most complete (and most underground) of our underground cities. Denrikuyu is estimated to have once been capable of housing 20,000 people, and actually connects to Kaymakli via an underground tunnel, eight kilometers long. The cities are just three
Turkey...These troglodyte cave-cities were excavated as early as Hittite times, and expanded over the centuries as various marauding armies traversed Central Anatolia in search of captives and plunder. There are 36 underground cities in Cappadocia and the deepest one is Derinkuyu underground city, while the widest is the Kaymakli Underground City.