The predecessor of the present Tüschenbroich Castle was built around 800. It stood on the large round motte in the present castle lake. This medieval castle however was completely destroyed during the Thirty Years' War (1618–1648).
Between the 17th and the 18th century the present castle was built on the site of the older outer ward.
In 1876 the southern tower and part of the main building collapsed during a storm. The remaining part was given a new facade and the collapsed part was never rebuilt. Of that southern tower only a ruin remains.
At present Tüschenbroich Castle is privately inhabited and can thus not be visited.
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.