YERALTI KENTLERI (UNDERGROUND CITIES)

No one knows when the underground cities of Cappadocia were built, perhaps in Hittite times or as late as the 6C AD. There were certainly underground cities as early as the 5C BC. They are referred to by a 5 and 4C BC Athenian historian Xenophon in his Anabasis. So far 36 underground cities have been discovered some of them being very recent. It is also estimated that most of them are connected to each other. But it is difficult to identify these connections.
The ground consists of the same volcanic tufa. Cappadocians created vast cities which cannot be noticed from the ground level. They carved airshafts as deep as 85 m / 300 ft into the rock and then made holes laterally at different levels in all directions. They hewed an elaborate system of staircases and tunnels to connect all layers to the surface. They dug dwellings, bathrooms, kitchens, dining halls, storage rooms, wine cellars, chapels, graves and suchlike. In times of danger they provided security by rolling big round hard stones across strategic tunnels. Entrances at the surface were also camouflaged.
Today even from some of the modern houses there are man-made holes leading to underground passages most of which are used as cellars.