Stary Dzierzgoń was one of the first Teutonic fortresses in the territory of Prussia.The castle was built in 1234 on the site of a Prussian stronghold. It was devastated in 1243 and abandoned in 1247 when the Teutonic Order moved its seat to the brand new castle in nearby Dzierzgoń. The outline of the moat and the embankments are the only remains of the fortress.
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.