The Tolštejn Castle (now reduced to ruins) was built in 1278 as part of the Zittau region's defense structure. George of Poděbrady ordered the castle to be seized shortly after the Hussite Wars and after many conflicts, the Tolštejn dominion was taken by 1471 by two Saxon princes, Ernest and Albrecht. During the Thirty Years War, the army of the Austrian Emperor occupied the castle. In 1607, the Swedish General Wrangel laid siege and burned down the castle.
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.