Neurathen Castle (Felsenburg Neurathen), which was first mentioned by this name in 1755, is located near the famous Bastei rocks near Rathen in Saxon Switzerland. This was once the largest rock castles in the region, but today only the rooms carved out of the rock, passages, the cistern and rebates for the timber of the former wooden superstructure have survived. In the years 1982–1984 parts of the extensive castle were used to build the open-air museum.
The beginnings of Neurathen date back to the first half of the 13th century, however the site may have been inhabitated already in the Bronze Ages. The castle was inherited and sold, repeatedly besieged, conquered and burned in the wars between Bohemian and Saxonian armies. In 1485 it fell to the Duke Albrecht, but he never restored it and the castle eventually collapsed. During the Thirty Years' War, his ruins served to shelter the inhabitants of Pirna before the Swedes.
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.