Drzewica Castle was built between 1527 and 1535 by Archbishop of Gniezno Maciej Drzewicki. The Archbishop built the castle on the peripheries of the town, by the river Drzewiczka and encircled the fortress with moats, separated by a bulwark. The building's plan is based on a regular rectangular shape. Its defence systems are based on four square towers located in each corner of the castle.
The building burned down in 1814, remaining a well preserved ruin. Thus, the castle did not undergo any later modifications, remaining one of Poland's best preserved residences from the first part of the sixteenth-century.
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.