Rosenburg Castle was built in the 12th century by the Counts of Riedenburg. It has been rebuilt and extended many times, right up to the present day.
In the Peasants' War , the castle was conquered in April 1525 by rebels and largely destroyed. A reconstruction took place between 1556 and 1560. In the Thirty Years' War the castle 1632-1634 was sacked several times. During the War of Spanish Succession Rosenburg was conquered by the Austrians.
The well maintained property now serves as a castle museum.
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.