The Monastery of Saint John the Theologian is located on the island of Patmos, Greece. Founded in 1088 by Saint Christodoulos, it is a significant center of Orthodox Christianity and is dedicated to Saint John the Apostle, who is believed to have written the Book of Revelation there. The monastery features impressive Byzantine architecture and houses a rich collection of manuscripts and religious artifacts. The monastery is also a UNESCO World Heritage Site, recognized for its historical and cultural importance. Pilgrims and visitors come to admire its stunning frescoes, the beautiful courtyard, and the serene atmosphere that reflects its spiritual heritage.