The existence of Saarbrücken was first documented in 999 under the name 'Castellum Sarabrucca'. In the 17th century the castle was rebuilt in the style of the Renaissance, but later destroyed and now only the cellars of this construction remain. In the 18th century Prince Wilhelm Heinrich had his architect Stengel build a new Baroque residence on the same site. Since then the castle has suffered various bouts of destruction and was partially burnt down and reconstructed before being thoroughly and magnificently renovated in 1989. The architect Gottfried Böhm designed a state-of-the-art central block of steel and glass. The castle is now both an administrative centre and a venue for cultural events, conferences and festivities.
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.