Tatlarin underground city, which was one of the most important underground cities of the Cappadocia region, could only be discovered in 1975 because its original entrance had collapsed and had gone underground to be opened to the visits of tourists in 1991. The toilet in it demonstrates that toilets were being used in Anatolia around 3000 years ago. There are many food storage areas and churches within it. It is believed to have been used as a center for religious or military purposes judging by the large size of its rooms. Only two floors of the Tatlarin underground city which has spread over a pretty large area can be visited currently, however works continue to open the other floors to visits as well. Although there is a large number of churches around and within the Tatlarin underground city which is near the Acýgöl district of the Nevþehir province a major part of them have collapsed due to natural causes.
The Tatlarin underground city is entered through a passageway that is approximately 15 meters long, and the entrance passageway opens to a relatively large hall. There is a sliding stone which has the purpose of sealing off the entrance in the event of an enemy attack. This sliding stone which could only be opened from the inside was used as an instrument of defense against animals and enemies.
Three skeletons were found in the section leading downwards from the right side of the hall. The kitchen found on the right side of the hall provokes the idea that this section was used as a burial ground in the Roman period and as a kitchen in the Byzantine period. That is so because the burial places in which the skeletons were found are identical with the burial places used in the Roman period. However, the interior part of the burial places were deeply carved out later so as to put food supplies in them. This large hall at the entrance is connected to a second large area with a zigzagging corridor. There is a trap and a sliding stone against intruders. There is a stable and five food supply storages carved into the floor in this second section which is supported by strong columns. And in the ceiling there is a ventilation well which provides access to the other parts of the city.