Derinkuyu, the largest and deepest underground city in Cappadocia, was founded in 1963 and can accommodate up to 20,000 people. It features living spaces, schools, churches, and ventilation shafts on multiple levels. The city's architecture features stone-made doors that were used to close off areas during threats. The tunnels and rooms showcase the civilization's advancement. Derinku... https://viztravels.com/turkey-tour/turkey-tour-packages-from-india/