The Burgtheater (Imperial Court Theatre) opened on 14 March 1741, the creation of the Habsburg Empress Maria Theresa of Austria who wanted a theatre next to her palace. Three Mozart operas premiered there. The theatre's first building adjoined the Hofburg at Michaelerplatz, opposite St. Michael's Church. The theatre was moved to a new building at the Ringstraße in 1888 designed by Gottfried Semper and Karl Freiherr von Hasenauer.
On March 12, 1945 the Burgtheater was largely destroyed in a bombing raid, and, one month later, on April 12, 1945, it was further damaged by a fire of unknown origin. After the war, the theatre was restored between 1953 and 1955. The classic Burgtheater style and the Burgtheater-German language were trend-setting for German language theatres.
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.