The Puerta de Palmas is a former city gate built in 1551. It has two cylindrical towers flanking the entrance door. Prince Philip II and Emperor Charles V and date of construction are mentioned on the outer side of the tower. The towers are fortified with battlements and they have two decorative cords at the top and bottom levels. Its entrance is east-facing, and is double-arched and is decorated with medallions of the shield of the Emperor Charles V. It was once used as a prison, but has since undergone many renovations and has been an entrance point to the city.
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.