Klisurski is a monastery of the Bulgarian Orthodox Church located in northwestern Bulgaria. It is the fourth largest monastery in Bulgaria. The complex includes two churches, three residential buildings, a farmyard and a kitchen.
Klisurski Monastery was founded in the 1240 during the Second Bulgarian Empire. It was repeatedly destroyed during the Ottoman rule. In 1862 it was burned down and the monks and pilgrims were killed by a Turkish pasha and his soldiers. The monastery was reconstructed in 1869 and the church was officially consecrated in 1891.
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.