The Château Saint-Sixte is a 12th-century castle in the commune of Freistroff. It stands on a small plain between Freistroff and Rémelfang. It was built in the 12th century by the seigneur Wirich de Valcourt.
During the Renaissance, it was transformed into a residence and was altered again in the 18th century. It was saved from ruin by the Gehl family in 1986. Separated from the village on the left bank of the Nied, it has a strange oval plan, surrounding by ancient moats. The six originally separate buildings are roofed with two slopes of tiles and arranged around an entirely enclosed courtyard. In each corner, a polygonal staircase tower gives access to the upper storeys.
On weekends and public holidays, the owners offer guided tours.
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.