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:Rosenborg Palace was built in the period 1606-34 as Christian IV’s summerhouse just outside the ramparts of Copenhagen. Christian IV was very fond of the palace and often stayed at the castle when he resided in Copenhagen, and it was here that he died in 1648. After his death, the palace passed to his son King Frederik III, who together with his queen, Sophie Amalie, carried out several types of modernisation.
The last king who used the place as a residence was Frederik IV, and around 1720, Rosenborg was abandoned in favor of Frederiksborg Palace.Through the 1700s, considerable art treasures were collected at Rosenborg Castle, among other things items from the estates of deceased royalty and from Christiansborg after the fire there in 1794.
Soon the idea of a museum arose, and that was realised in 1833, which is The Royal Danish Collection’s official year of establishment.