This Monastery look more like a castle from the outside as it is a fusion of monastery and castle. It is one of the oldest and most important monastic centers of the East, while in its vast area you can find important attractions like the Ecclesiastical Museum, the Library (which in not open to the public), unique icons and a wonderful wood-curved templon. The monastery was built during the 11th century A.C. at the position of an older early-Christian basilica, which was in turn build on top of an ancient temple of Goddess Artemis.