Kost Castle is is privately owned by Kinský dal Borgo noble family. It was first proposed by Beneš von Wartenberg in 1349 as a possible construction site and was completed by his son Peter von Wartenberg. It retains most of the original features and is overall very well preserved and maintained.
The castle is known for its so-called 'White tower'. In about 1414 the family of Zajíc von Hasenburg moved there; later the family of Schellenberg (1497 - 1524), Lobkowicz (till 1576) and others; in this time some more buildings were built near the castle and joined to it.
Unlike most other castles in Bohemia, it does not lie on a hill, but on a spit between two brooks. Another peculiarity is the tower, which has a trapezoid-like ground-plan. The trapezoidal tower has the corners facing the areas of most likely catapult attacks. This is to make the missiles glance off the tower walls instead of hitting it headon thereby minimizing the damage.
The castle is open to the public and hosts events and exhibitions.
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.