Castello Barbarossa is an archaeological ruin and ornithological station on the island of Capri. It derives its name from the pirate and Ottoman admiral, Hayreddin, nicknamed Barbarossa ('Redbeard'), who stormed it in 1535 and destroyed it in 1544. The construction date is uncertain but it perhaps dates back to the late ninth century. From 1898, the structure, now in ruins, was owned by the Swedish psychiatrist Axel Munthewho donated it to his foundation. The surroundings, interesting for their botanical features, are home to the island's ornithological station.
The plan of the castle is quadrangular with a semicircular wall. The ruins of the highest part, as well as forming the core of the building, belong to what was once the residential area of the castle. Indeed, there is a chapel with a vaulted apse, a belfry and a cistern that was used as a warehouse Another area, offset from the chapel, retains many features, including a vaulted roof, a small partly walled embrasure, and an arched opening. Finally, there is a room with an iron-beamed roof. Built of local stone, the fort has vaulted roofs and tiled floors. The most significant architectural features are its two towers, indicating the military function of the castle. One of them, square-shaped, was built in the Swabian period, the other, however, is circular and was built in the Angevin period.
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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.