Located 14 km northeast of Avanos, this underground city was built on the northern slopes of Mt. Idis in an area with lots of strata made up of volcanic granite. The extensive galleries of the city are spread out over a large area and connected to each another by tunnels. The underground cities in Kaymakli and Derinkuyu, are very narrow (5 cm) and there are long holes between the different levels of the city that used to provide communication between the different levels of the city. The ventilation of these neatly carved out rooms was provided by these holes when the city was sealed up against enemies.

The city was discovered in 1972 by the local muezzin and farmer Latif Acar, when he was trying to find out where the water disappeared, which was tending to his crops. First of all, he found an underground room which, , was revealed a whole city housed with an incredible 60,000 people for up to three months, after excaveted. A total of 10 floors were discovered, to a depth 40m, although now only four are open.

It is unlikely that the other underground cities in this area, besides the rolling stone doors, there were holes above the tunnels used for dumping hot oil on the enemy. Similar to Kaymakli and Derinkuyu, Ozkonak has a ventilation system, a water well, a winery and rolling stone doors.