A view of Great Meteoran Monastery perched on the cliffs in Meteora, Greece. It is both the oldest and the largest of the monasteries at Meteora. If I recall, there is also quite a bit to see here as you are allowed to walk around and see more than at some of the other monasteries.

https://www.visitmeteora.travel/en/what-to-see/the-meteora-monasteries/great-meteoron-monastery

https://en.wikipedia.org/wiki/Meteora

http://whc.unesco.org/en/list/455