“At 8,000 feet, on the central plateau of Ethiopia stand 11 churches, each carved from a single, gigantic, block of stone. No bricks, no mortar, no concrete, no lumber, just rock sculpted into architecture. Not much is known about who built them, or why. But the faithful of the Ethiopian Orthodox Church say there's no mystery really. The churches of Lalibela were built by angels.”
https://www.cbsnews.com/news/lalibela-11-churches-each-sculpted-out-of-a-single-block-of-stone-800-years-ago-60-minutes-2019-12-01/#
