In the upper Myosen period in the Cappadocia region as a result of the vulcanic eruptions occurred in Erciyes, Hasandag and Gulludag, in the region was formed a large tableland from the vulcanic tufas and together with the eros
ion of the Kizilirmak river and wind over ten thausands of years there appeared the chimney rocks which are a wonder of the nature. In the old Bronze Age the Cappadocia which was the population zone of the Assyrian civilization later has hosted the Hittite, Frig, Pers, Byzantine, Seljuk and Ottoman civilizations. The first Christians escaped from the persecution of the Roman Empire in the 2nd century B.C. came to the Cappadocia over the Antakya and Kayseri and they have settled here. The first Christians finding the underground cities from Cappadocia have been hidden in these underground cities which gates were made in such way in which they couldn't be easily observed and they have escaped from the persecution of the Roman soldiers. Due that they had live in the underground cities for long duration without being able to go out they have developed these underground cities by making provisions rooms, ventilation chimneys, wine production places, churches, abbeys, water wells, toilets and meeting rooms.
In the prehistoric periods the first human settlements have begun and the humans have constructed the underground cities in the volcanic rocks in form of tufa due to protect themselves from the wild animals and they lived for long times in these underground cities. There are so many underground cities on the Cappadocia area of Turkey but the biggest is Derinkuyu Underground City.
Here is the newest 
