The castle was the acropolis of the unwalled settlement of Chorio, on the NE part of the island at a height of 154 metres, on the site of an ancient acropolis. There are three distinct building phases: Hellenistic, Byzantine and Hospitaller. The castle covers an area of 1,250 square metres with a perimeter of 140 metres. Of this perimeter today survive the south and east walls, part of the Hellenistic defences and Byzantine walls with Hospitaller additions. To the NE stands a round tower, while a plain semicircular bastion is the only feature which may be securely assigned to the Hospitaller period. It preserves the arms of grand master Emery d’Amboise (1503-1512) and the order of the Hospital with the date 1507. The main gate is located in the middle of the east walls. IThere are three churches within the defences: the church of Our Lady (Panayia Kyra) with its cistern, of St. Michael Tharrinos and of the Great Virgin. 

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