Part 3/9:
Many ancient underground cities have fascinating backstories, arising as enclaves for those seeking refuge from persecution or harsh realities above ground. For instance, Derinkuyu in Cappadocia, Turkey, one of the largest and deepest subterranean cities known, dates back to the 8th century BCE. This extensive network of tunnels once offered shelter to potentially 20,000 inhabitants, complete with resources like water wells and food storage areas.