The 11 medieval monolithic cave churches of this 13th-century 'New Jerusalem' are situated in a mountainous region in the heart of Ethiopia near a traditional village with circular-shaped dwellings.

If you see a forest in Ethiopia, you know there is very likely to be a church in the middle, says Alemayehu Wassie. Wassie, a forest ecologist, has spent the past decade on a mission: preserving ...