Arreskov was owned by the Crown and in 1241 Duke Abel inherited the castle from his father, King Valdemar Sejr. Some years later, the castle was captured and destroyed by his brother Erik Plovpenning. Arreskov was captured once again and destroyed in 1264 by King Erik Glipping. The present castle is third on the site, built in 1558. The castle mound is about 100 m x 35 m. The rectangular castle embankment is protected by a moat and circular outer ramparts. Today, the ramparts are partly destroyed and the castle embankment is overgrown. Not far from Gammel Arreskov stands another castle mound called Perdeholm. The castle and park is open by appointment.
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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.