Derinkuyu Yeralti Kenti (Underground City of Derinkuyu)

The underground city of Derinkuyu which means "deep well", like Kaymakli, is one of the largest. It was opened in 1965. It is 70-85 m / 230-300 ft deep with 53 airshafts. The original ventilation system still functions remarkably well. It is not recommended that visitors having problems of claustrophobia or restricted movement go inside since there are many passageways where one has to squat.
The first two floors under the surface housed a missionary school with two long rock-cut tables, baptismal place, kitchens, storehouses, living quarters, wine cellars and stables. Third and fourth floors were for the tunnels, places to hide and armories. The last floors had water wells, hidden passageways, a church, graves and a confession place.