Orongo

Orongo is a stone village and ceremonial centre at the southwestern tip of Rapa Nui (Easter Island). It consists of a collection of low, sod-covered, windowless, round-walled buildings with even lower doors positioned on the high south-westerly tip of the large volcanic caldera called Rano Kau. Below Orongo on one side a 300-meter barren cliff face drops down to the ocean; on the other, a more-gentle but still very steep grassy slope leads down to a freshwater marsh inside the high caldera.

• http://en.wikipedia.org/wiki/Orongo