The Castle of the Knights of St. John is in Mandraki, built high on a rock at an altimeter of 150 meters. The castle is a reminder of the Knights of St. John
from the island of the Knights of St. John passing from the island, who in 1315 created here also a magnificent castle that stands today monumental and mansion. Inside the castle is the Monastery of Panagia Spiliani dedicated to Kimisi of Theotokou (assumption) and is the patron saint of the island. The monastery is celebrating on August 15 and is great festival.