Château du Kagenfels (also known as Kaguenfels or Kagenburg) is a ruined castle situated in the Forest of Obernai, in the commune of Ottrott. The castle was constructed in 1262 by Albrecht von Kage, Ministerialis of the Bishop of Strasbourg. The castle passed successively to the nobles of Hohenstein, then to Utenheim and Ramstein, who sold it in 1559 to Lucas Wischbech who repaired and enlarged it. In 1563, the town of Obernai bought it. It was destroyed during the Thirty Years War and is recorded as ruins in 1664.
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.