The Venetian Castle in Kythira is definitely the most distinctive monument on the island. It was built from the late 12th century until the early 13th century in Chora during the Venetian occupation. Due to its strategic position, providing good observation points to the Ionian, Aegean, and Cretan Sea simultaneously, they called it The eye of Crete.
The castle was built in different phases but the biggest part was completed by the Venetians in 1503 AD. who made some additional works and repairs. On the left side of the castle's entrance, there were the prisons whereas on the right side there is a huge cistern that dates back to the Venetian period. In the center of the castle, you can see the ruins of some two-storied houses where the conquerors had settled down.
Inside the castle, there are four churches. The oldest church is the Church of Pantokrator, built in 1545 and featuring impressive old frescoes. However, the biggest church of the castle is Panagia Myrtidiotissa, built in 1580. It was originally Catholic, but in 1806 it became an Orthodox church. The miracle-working icon of Myrtidiotissa was kept in the church for almost two centuries, to protect the city from the pirate's invasions.
In front of the temple, there are the old residences. Today, the building houses the Historical Archive of Kythira. Right next to it there is the church of Panagia Orphane, meaning Virgin Mary the Orphan. Outside the fortress, on the north side, there is a second castle wall with many churches and houses as well. The castle has many cannons dating from the Venetian, the Russian-Turkish and the English period.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.