Käru (Kerro) was established as an estate in the mid-18th century. The present building was built in 1878 and designed by Riga architect Robert Pflug. It is an eclectic building with mainly neo-Renaissance elements. It was damaged during the Revolution of 1905 and also during World War II. The manor house ensemble has several well-preserved and unusual outbuildings and annexes. Explorer Karl von Ditmar was the landowner of Käru and economist Ragnar Nurkse (1907–1959) was also born in Käru Manor. In the 1920s the manor started to work as a school. After the new school building was closed, the house was sold into private ownership.
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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.