Acaya Castle wa built by the Knight Alfonso of Acaya in around 1506. In the following years, his son Gian Giacomo dell'Acaya, a famous architect, rebuilt the entire complex, transforming it into a fortified hamlet and making it the main centre of his estate. He also renamed it Acaya. After his death in 1570, the hamlet was sold and Acaya began to decline slowly, until its rebirth in the 20th century.
The Castle, which has a trapezoidal base, is accessible through a single bridge. The fortified walls are reinforced by two cylindrical towers. A stairway leads up to the rooms on the upper floor, including the bastion hall, with its painting of the Spanish Kings' coats of arms, and a room decorated with classically-styled motifs carved in Lecce stone.
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.