Rosenborg Castle was originally built as a country summerhouse in 1606 but King Christian IV loved it so much that he lived and died in it. It is a beautiful historic building and a fascinating museum of cultural history. It houses some of Denmark’s greatest treasures. Among the main attractions of Rosenborg is the Long Hall with the coronation throne with three silver lions standing guard. And beneath the castle, the three treasuries with the Crowns and the Crown Jewels.