The Venetian Castle of Saint George in Kefalonia is located 7 km southeast of Argostoli, above the village Peratata. It has a polygonal shape and covers an area of 16,000 sq. m. This castle was originally built in the 12th century by the Byzantines but it was mostly the Venetians who gave it its present form. In fact, its external walls were built in 1504 by the Venetians.
The castle is ruined today and only a few buildings survive. It was not only the time and wars that caused its damages. This castle also suffered a lot from the earthquake that hit Kefalonia in 1956. At the time of its glory, inside the Castle, there were residences, public buildings, storehouses with food and guns, churches, hospitals, prisons, cisterns of water and generally an organized town. In fact, this Castle was the capital of Kefalonia before Argostoli was made the new capital in 1757. Close to a small square in the castle, you will also see the ruins of the Catholic Church of Saint Nicholas.
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.