An ancient and surprising underground city where thousands of people lived.😲🤯 Although the Derinkuyu underground complex, located in Turkish Cappadocia, gained popularity in the 1970s, when Swiss researcher and author Erich Von Däniken revealed it to the world through "The Gold of the Gods", Derinkuyu had long been raising questions. especially among archaeologists in his country. It was discovered accidentally when a man knocked down the wall of his basement. Upon arrival the archaeologists revealed that the city was 18 stories deep and had everything necessary for underground life, including schools, chapels and even stables. Derinkuyu, the underground city of Turkey, is almost 3,000 years old, and once housed 20,000 people.