Frauenalb Monastery was founded in the late 12th century. It accepted as members only daughters of noble families. The accidental fire destroyed the monastery in 1508 and only abbey church built in 1404-1406 survived. The rebuilt monastery was looted again in 1525 during Peasants War.
Shortly after 1600 the last woman left the monastery. Today a foundation takes care of the preservation of the remarkable ruin.
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.