Duke Ulrich built Schorndorf Castle in 1538 on the site of what had probably been an older moated stronghold. It formed part of the state of Württemberg's Schorndorf fortifications and was erected with vast effort and outlay, making it the mightiest town fortress in the whole of the duchy in the 16th century. Today Schorndorf Castle is the seat of the city's district court.
In the castle grounds you can see remains of a former bastion of the town fortifications as well as several sculptures (late 20th century) which are part of the Schorndorf Sculpture Trail.
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.