The Regensburg Museum of History, currently resides in a former Minorite monastery, is a museum of the history, art and culture of Regensburg and eastern Bavaria from the Stone Age to the present day.
The former monastery of St Salvator, located in the city's Dachauplatz district, was founded in 1221 by the Bishop of Regensburg Konrad IV of Frontenhausen, Count Otto VIII of Bavaria, and King Henry VII. The three-naved basilica church was considered the largest church of the order in southern Germany until its closure in 1799.
The church and most of its monastic buildings survived, with the monastic buildings converted as barracks and billets for the Bavarian Army, and the church as a customs hall, a drill hall and a hotel until it became the location of the Regensburg Museum of History in 1931.
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.