Derinkuyu Yeraltı Şehri (Derinkuyu Underground City) was built in the 8th - 7th centuries B.C. by the Phrygians and enlarged in the Byzantine era. With its eleven floors extending to a depth of approximately 85 m, it was large enough to shelter tens of thousands of people together with their livestock and food stores. It is the largest excavated underground city in Turkey and is part of a network of several underground complexes found across Cappadocia. The city is connected with other underground cities through miles of tunnels.
All the usual rooms found in underground cities can be found at Derinkuyu, including stables, storage rooms, refectories, churches, and wineries. As well, there were areas where the dead could be placed until such time as conditions on the surface would allow their proper disposal.