Plauen Castle was built around 1250 as the seat of the bailiffs of Plauen. From 1466 it served as the Electoral Saxon official seat, burned down in 1548, was rebuilt around 1670 as a secondary residence of Saxony-Zeitz , served again after 1718 as the Electoral Saxon official and court seat and from 1852 as a prison.
In April 1945, the large area was significantly destroyed by air raids, along with large parts of the old town. Cell tracts that were preserved continued to serve as a penal institution after the war and were only demolished in 2013. An archaeological excavation followed. In the future, the campus of the Plauen State Study Academy will be housed in new buildings on the premises , with the ruinous historical building fabric being preserved and partially rebuilt.
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.