Sumela is 1600 year old ancient Orthodox monastery located at a 1200 meters height on the steep cliff at Macka region of Trabzon city in Turkey. Pontian Greek monastery, built by the Pontic Greeks who lived there from 700 B.
These troglodyte cave-cities were excavated as early as Hittite times, and expanded over the centuries as various marauding armies traversed Central Anatolia in search of captives and plunder. There are 36 underground cities in Cappadocia
The region of Cappadocia, Turkey is unique in many ways. On the surface the landscape is covered in unusual rock formations and ancient cave dwellings, while below the ground lie the remains of several underground cities. must visit one day :)