Mindelburg castle was built probably during the 12th century. It was destroyed in 1305 and rebuilt in 1370 by Friedrich von Teck. The castle as wass not changed much in the last centuries. The complete annex displays the typical structure of a European fortress, including a donjon. This architectural ensemble is used to stage several festivals and markets.
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.