The first record of Kirumpää Castle (in German Kirrumpäh) dates back to the year 1322. It was one of the residences of Bishopric of Dorpat. The castle was destroyed in a Swedish-Russian war in 1658. Much of the ruins were used for construction in Võru town in XVIII-XIX century. Today, there is little left of the former castle. The ruins are located on a small scenic hill.
Reference: Wikimedia Commons
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.