The Weathered of Rumelian Castle
Rumelian Castle or also known as Rumelihisari is a fortress located in Sariyer District of Istanbul, built along the strait of Bosphorus. The name of the castle was taken from the neighborhood around it. The castle was built from 1451 to 1452 based on the orders of Ottoman Sultan, Fatih Sultan Mehmet purposed as preparation of the conquest of Constantinople (now Istanbul) in 1453. After the conquest of the city, the castle was used as customs check points and occasional prison. Due to its old age, the weathered structure of the castle had been repaired, and the castle itself was continued to use until the 19th century. Today, it’s a popular open museum for the publics.
Note: information taken from Wikipedia.