Falkenstein castle was originally built by the Bishop Tuto of Regensburg before 1074. The medieval stone castle was built in the early 13th century. It was expanded and rebuilt several times before the castle was burned down by the Swedes in 1634 (during Thirty Years' War). The decayed Falkenstein castle was restored in the 20th century. Today the castle is a museum, festival venue and restaurant.
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.