Janowiec Castle was most likely built by Mikołaj Firlej between 1508 and 1526, on a steep Vistulan hillside in Janowiec. It expanded by his son, Piotr, the Voivode of the Ruthenian Voivodeship. The bastion, used as a residence, was destroyed by the Swedish army in 1655 during The Deluge.
Although the following owners of the castle did their very best to rebuild the castle, the castle never managed to regain its former glory. In 1928, an archaeologist, Leon Kozłowski had taken over the castle, but his plans to reconstruct the castle were stopped by the Second World War. After the Second World War, the castle was left in its former state, being one of many private castles. In 1975, the castle was bought by the Nadwiślańskie Museum in Kazimierz Dolny in Poland.
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.