The floor of the Akershus Castle served as the private apartments for Danish and Norwegian kings dating back to the 1600s. It was later remodeled into one large room designed in a Nordic Baroque style. Decorations include furniture, rugs and tapestries from the 16th and 17th centuries. The room is called the Hall of Christian IV in honor of Denmark’s longest reigning monarch. He was also the King of Norway from 1588 until 1648.