[1] Kastro is built on top of a steep hill near the eastern coast of the island, at an altitude of 80 meters.

[2] Kastro was probably created in the 14th century, and may have been built by the House of Coruña, who captured the island from the Byzantines in 1307.

In the ruins of Despotikos, which was the residence of the local lord, there is an inscription from 1365, with the name of Giannoulis da Coruña.

[2] Kastro became the main village of the island with estimations of its population in the beginning of the 17th century being at 5000 residents.

It hosts collections with sculptures, pottery and coins of Greek and Roman antiquity.