Schlettau Castle dates probably from the 13th century. In the 14th century the castle was extended to a Gothic-style castle palace by the Schönburg-Crimmitschau family.
From 1413 to 1536 Schlettau belonged to the Cistercians. After the secularization in 1536 it became the property of the Saxon Electors, who used it as a hunting lodge. The still existing stuctures consist of a Renaissance section (about 1620) and two Baroque wings (early 18th century). Today it is restored and hosts a museum.
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.