The Allenburg Church is a Brick Gothic building established near Allenburg Castle by Konrad von Jungingen, the Grand Master of the Teutonic Knights, in 1405. Seriously damaged during the First World War, the medieval building was restored and slightly expanded in 1925. After the Second World War, Allenburg was renamed Druzhba. It is now part of Pravdinsky District of Kaliningrad Oblast. The church was used by local farmers as a grain-drier. It was restored by the local Lutheran community in 2005 and eventually passed to the Russian Orthodox Church in 2010.
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.