Until recently, Derinkuyu was the largest known underground city in Cappadocia. In 2013, however, construction workers discovered another underground city during the building of a housing project. This city— located beneath the city of Nevsehir—is one of the largest known underground cities in the world. According to researchers, this newly discovered ancient city could cover over 450,000 square meters and is over 110 meters deep. This means that using only simple tools, the ancient builders dug an area big enough for 65 soccer fields, and deep enough to contain a 35-story building! \