Schloss Weinberg is an Upper Austrian castle complex and is located on the vineyard above the village of Kefermarkt in the Mühlviertel. The first castle in this location was built in the 11th century. The conversion into a Renaissance castle was made by Hans Wilhelm von Zelking in 1600. The Thürheimer bought the property in 1629. After becoming almost uninhabitable in the early 1980s, Upper Austria rented the castle in 1986 for 99 years, the renewed and organized in 1988 a national exhibition on the premises. Since 1989 the castle has been used as a regional music and education center.
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.