It is thought that Tatlarin Underground City serves a different purpose with its large halls and many churches. It is estimated that the city was used as a military garrison rather than civilian life. 3 skeletons had found that were thought to be belonging to the Romans. The main entrance has been demolished and the halls can be reached with a passage of 15 meters. The first underground toilets of the world were built in the underground city, where the connection between the departments was provided with sliding stones. Only 2 floors of Tatlarin Underground City are open to tourists.