The two castles of Kleinvernich and Großvernich have guarded the eastern and western banks of the river Erft since 1350. The two-part Grossvernich Castle, known as a 'castrum' with a moat, was built after 1300 near the surrounding wall, which today is hardly discernible.
Kleinvernich Castle is still entirely surrounded by a moat today. However, the estate is used exclusively for agriculture. The only memorial to the late-gothic castle in Grossvernich is the ruin of a tower which is in danger of collapse.
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.