Bierzgłowski Castle was one of the oldest stuctures built by Teutonic Knights. The Gothic style castle was built between 1270-1305 to the site of previous castle (from the 1260s), which was destroyed by Lithuanians in 1263. Bierzgłowski castle has been rebuilt several times between 15th and 19th centuries. The castle has an unique ceramic relief in a one of portals. It depicts a horseman and two knights and is one of the oldest known Prussian ceramic artefacts.
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.