Once two-part Langendorf Castle was built in the 12th and 13th centuries as main and fore-castle surrounded by a moat. The round corner-tower of the late-gothic manor house dates back to the 15th century, as does the oldest part of the manor house. The more recent part of the manor house includes the chapel bay window and the courtrooms. The fore-castle with three wings was renovated in the 16th century, of which only the west wing has been preserved until today.
Today Langendorf castle is one of the best preserved and maintained moated castles in the Rhineland. Regular concerts are held there, entitled 'Concert in the Outbuilding' for up-and-coming young artists.
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.