Blasimon Benedictine abbey was founded in the 10th century. The 12th century church is still standing, restored in the 15th and 16th century. In the past, monks dug ditches fill with river Gamage's water, surrounding the abbey. These ditches transformed the abbey to a stronghold. Unfortunately, the French Revolution damaged the abbey and today it is ruined.
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.