A church carved from solid rock

I often talk about stone architecture. Vernacular methods of building with stone are especially interesting.  St George church in Lalibela, Ethiopia was built in the 13th century along with others in the region. It is carved out of solid rock. How cool is that?  In a few places in the world builders have carved structures out of solid rock. Petra, in Jordan, the Elephanta caves in India, the vernacular dwellings in Cappadocia, Turkey come to mind. Times article on these stone churches in Ethiopia.