Wukro Chirkos - Credit: Wikimedia Commons
Wukro Chirkos is an Orthodox Tewahedo monolithic church located in northern Ethiopia, on the northern edge of the town of Wukro near the main highway. From the time members of the 1868 British Expedition to Abyssinia reported its existence until the early 20th century, it was the only rock-hewn church known to the outside world.David W. Phillipson, Ancient Churches of Ethiopia (New Haven: Yale University, 2009), pp. 94f Read more on Wikipedia
Source: en.wikipedia.org