Schloss Greifenstein is a castle in the mountainous Fraconian Switzerland region of Upper Franconia, Germany. Since 1691 Greifenstein, the 'stone stronghold' of Heiligenstadt round its walls, is the seat of the noble Schenk von Stauffenberg family. Greifenstein is a prominent feature of the modern tourist itinerary called the Burgenstraße.
The Gothic castle that was first noted in 1172 was ruined and pillaged during the Peasants' war of 1524-1525 and was subsequently rebuilt. Then Marquard Sebastian von Schenk von Stauffenberg, Prince-Bishopric of Bamberg, took possession and rebuilt Greifenstein in Baroque style from 1691 to 1693, under the direction of the Bavarian architect Leonhard Dientzenhofer; consequently, as a seat of the bishop it is sometimes called Greifenstein Palais, though the aofficial bishop's palace stood (and still stands) in Bamberg.
A comprehensive restoration was carried out by Otto Philipp Schenk, Graf von Stauffenberg, in 1975–77.
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.