7Sumela Monastery, Turkey
Nestled into a sheer cliff in northeastern Turkey’s Pontic Mountains, Sumela Monastery is a remarkable example of Byzantine architecture. Established in the 4th century, this Orthodox monastery is dedicated to the Virgin Mary and has long been a pilgrimage site for Christians. The steep climb to the monastery reveals its impressive setting, with buildings embedded into the rock face overlooking the lush Altındere Valley. Its frescoes, chapels, and dramatic location make Sumela one of the most visually stunning monasteries in the world.