Brüggen Castle was the most important castle in the north of the Duchy of Jülich. The castle was built by the Count of Kessel in the 13th century to guard a ford over the River Schwalm. In the early 14th century it went into the possession of the dukes of Jülich, who had the existing building replaced by a quadrangular castle made from brick. After the occupation of Brüggen in 1794 by Napoleonic troops it was confiscated and resold by the French government to a private individual at the beginning of the 19th century. Today part of the castle houses a hunting and natural history museum.
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.