The Castle of Assos was constructed in the 16th century by the Venetians to protect the island from enemy attacks. It is built on the peninsula of Assos, in a highly strategic position and today you can enjoy the view. The Castle of Assos in a venetian style structure had four entrance gates, but only two remain today. Within the ruins, you will find some interesting structures, such as the small church of Agios Markos and the house of the Venetian High Commissioner. A little lower down the hill there is another chapel dedicated to Prophet Elias, which also contains a beautiful wooden carved iconostasis.