The amazing Frankish castle is one of the most important monuments on the island of Paros. It is located upon the hill of Agios Konstantinos in the main town of Paroikia. It was built in the 1200s by the Venetians who then had occupied Paros and had made Paros a part of the Duchy of Naxos. Scholars have said that the castle must have been built from the vestiges of an assortment of ancient sanctuaries that were found scattered here and there upon Paros. The castle stands out for its amazing architecture and its intricate stonework and the hundred footer Hekatompedon that has been engraved into its walls.