The National Historical Museum (Historiska muséet) covers Swedish cultural history and art from the Stone Age to the 16th century. The museum is known for its so called "Gold Room" (Guldrummet) by the architect Leif Blomberg, where a large number of gold objects are kept as part of the exhibition. The museum hosts also the largest Viking exhibition, with more than 4,000 original artifacts.
References:The Gravensteen is a castle in Ghent originating from the Middle Ages. The name means 'castle of the counts' in Dutch. Arnulf I (918–965), Count of Flanders, was the first to fortify this place, building a medieval bastion on this high sand dune, naturally protected by the river Leie and its marshy banks. This bastion consisted of a central wooden building and several surrounding buildings, also in wood.
In the early 11th century, the wooden building was replaced by a stone residence, consisting of three large halls that made up three storeys, connected by a stone stairwell. The monumental stone staircase, the light openings, the fireplaces built into the walls and the latrines were signs of considerable luxury and comfort in those days. There was probably also a tower.