The town of Kętrzyn (until 1946 Rastenburg) was founded by the Teutonic Knights at the Prussian settlement called Rast. Initially there was a wooden watchtower, around which developed a settlement. In 1357 the commander of Bałga Johann Schindekopf granted the settlement civic rights. Shortly thereafter, in the city began construction of the defensive church dedicated to St. George, castle and defense walls.
The Kętrzyn castle was raised in the second half of the 14th century in the south-west corner of the urban battlements. Castle contained a chapel, bakery, kitchen, mill, malt house, brewery, the meat store, grain silos, storage, armory and a powder magazine. The most representative northern wing was occupied by pfleger - prosecutor, official position of the Teutonic Order. After the year of 1525 the castle became the county seat of the Duke of Prussia. In 1910 the castle was taken over by the municipal authorities, Until World War II there was a finance office and housing for authority officials. Initially it had a triangular winged structure, closed on the west side wall with a gate. Numerous of reconstructions over the centuries, adapting the object to perform administrative functions and residential buildings changed the face of the object. In January 1945, the castle was burnt down. During the reconstruction of the castle was restored in the years 1962-1966 the Gothic character of the building. Currently in the Kętrzyn's castle are functioning: the public library and museum by the name of Wojciech Kętrzyński, and as well as with the interesting regional collections.
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.