Derinkuyu Underground City
LocationTurkey
Year800 BC
TypeUnderground City
About Derinkuyu Underground City
The largest excavated underground city in the world. Extends 280 feet down through at least 18 levels. Could shelter 20,000 people with livestock and food stores. Ventilation shafts reach the surface from the deepest galleries. Tunnels link it toward other underground cities nearby. Used for centuries as a refuge from raids.