Derinkuyu - massive ancient multi level underground cities

#ancienttechnology #ancientstructure #archaeological The Derinkuyu underground city is an ancient multi-level underground city located in Turkey. The city has at least eight levels and depth of 85 meters , deeper than any of the other underground complexes found in the area, and is fitted with thousands of ventilation shafts and water ways that provided fresh air and water to each level of the site. It is large enough to have sheltered as many as 20,000 people together with their livestock and food stores. It is the largest excavated underground city in Turkey and is one of several underground complexes found throughout Cappadocia. The city was protected by doors made of massive stone wheels that could be rolled in from of an entrance, essentially making it another wall.