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:Bomarsund fortress and garrison was built in 1832-1854 by Russian Empire to defence Åland Islands against enemies. British and French fleet attacked against it during the Crimean War in 1854. After a week of fighting the British stormed the remaining fort. Anglo-French forces destroyed it totally after battle. In the Treaty of Paris 1856, the entire Åland Islands were demilitarized, which is a status that has been preserved until this day.
Nowadays there are some ruins left and fortress area is open for visitors.