The massive rock massif with sandstone and conglomerate formations lies at the northwest end of the Thessaly plain. Its rocks are 540 m high. Since 1988, this area has been included in the UNESCO World Heritage List.
There is a complex of 24 Orthodox monasteries on the tops of the rocks. It is the second most important and largest monastic complex in Greece, second only to the complex on Mount Athos, and today only six monasteries are permanently inhabited. Most of the buildings are open to the public, only the right clothes are required to cover the legs and arms.
The first monastery was built here in 1336. Initially, building materials and food for the monks were transported by ropes, but now monasteries can be reached via stairs and platforms.