Gimborn Castle is a former water castle located in the upper Leppe valley. It was pledged in 1273 from the county of Berg to the county of Mark, and became the Residenz in the county of Gimborn Neustadt of the House of Schwarzenberg in 1631. Since 1874 the castle has belonged to the Barons von Fürstenberg zu Gimborn.
Since 1969 the Castle has served as a conference site and meeting place for the International Police Association.
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.