Kaymaklı Underground City
Troglodyte underground cave-cities existed in Anatolia as far back as the Hittite era, around 1600BC. They expanded over the centuries as invading armies crossed Central Anatolia, plundering and murdering as they went.
There are 36 underground cities in Cappadocia with hundreds of tunnels and passageways. The biggest is at Kaymaklı Underground City and the deepest at Derinkuyu.