Hidden beneath Turkey's Cappadocia region, Derinkuyu is a vast underground city that once housed 20,000 people and remains a marvel of ancient engineering.

Cappadocia, a stunning region in central Turkey, is known for its unique landscapes, ancient cave homes, and famous hot air ...

Lift off over gorgeous Cappadocia ... scratch beneath the surface. Derinkuyu is one of the deepest excavated underground cities in Turkey, dug out in early Christian times, when believers hid ...