Ehrenstein Castle was first time documented in 1331. It was destroyed by Swedish army during the Thirty Years' War and not rebuilt again. Today two towers and some walls remain.
The adjacent Ehrenstein monastery was built by the castle owner Bertram von Nesselrode in 1486-1488. Today the church remains and contains some beautiful medieval glass paintings.
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.