Above the gorge of Kalarytikos River in Greece’s Tzoumerka mountains, a monastery dedicated to the Virgin Mary stands at the entrance of a cave in a vertical cliff. The sharp cut of the rock hides the Monastery of Kipina, a monument of Christianity built using materials from the surrounding mountains. In the early 13th century, a group of monks from the nearby Vyliza Monastery set out to establish a new order after a disagreement with their abbot. While looking for a location, they saw a hole in the mountain that turned…