This underground city is hollowed out of volcanic granite tufa on the Northern flank of Mount Idris, 14km from Avanos. The well spread out galleries are connected by tunnels.
Özkonak Underground City
Long, narrow shafts running between the floors acted as communication channels, a feature not found at Derinkuyu or Kaymaklı. These shafts also provided ventilation when the doors to the rooms were closed. Something else not found in the other cities are the holes in the tunnels behind the door stones. These were presumbably used to pour boiling oil on the enemy.
As in the other cities, ventilation shafts, wells, wineries, and door stones are found at Özkonak.