Gmünd Castle dates from the mid-13th century. During the Austrian-Hungarian War in 1487 it was occupied and destroyed by the troops of King Matthias Corvinus after a seven-years-long siege, and rebuilt from 1502 to 1506 under the Salzburg archbishop Leonhard von Keutschach. During the German Peasants' War of 1525, it was again besieged, though not captured. Archbishop Wolf Dietrich Raitenau had the building enlarged in 1607. Devastated by a fire in 1886, it was restored from 1950 and is today used for theatrical performances, concerts and lectures, including a viewing tower and a restaurant.
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.