History

Derinkuyu, in Turkey, is an ancient underground city dating back 2500 years and extending to a depth of about 60 metres and able to support 20,000 people, and their cattle. Subterranean cities were though to protect inhabitants from invasion, allowing thousands to live in secrecy pic.twitter.com/0jK5kruMoY

— Science girl (@gunsnrosesgirl3) April 3, 2023