Unterhof Castle was first mentioned in a document in 1185. It served as the seat of the stewards of Diessenhofen. In Rudolf of Habsburg in 1264, who incorporated the stewards of Diessenhofen into his service. Until 1399, the castle was expanded with the two-part east wing (northeast and southeast tracts) and the keep, as well as reinforced with a new defensive wall.
Unterhof has been renovated extensively since 1990. The old part of the castle continues to function as a restaurant.
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.