The Castle Church of Schleiden, a late-gothic three-nave hall-church with an interesting net-and-star vault, was built between 1516 and 1525 according to the plans of Johann Vianden. This Castle Church is the Catholic parish church today. On the end walls of the side aisles are precious glass paintings from 1535, a valuable König organ (constructed around 1770) and a sarcophagus made of black marble. Equally remarkable are the late-gothic glass windows, the vault paintings and the Flemish altar wing.
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.