The stone church of Sund was built at the end of 13th century or at least before 1310. Church was damaged by fire in 1672 and again in 1921. The church bells were destroyed in both accidents. There are still an altarpiece and wall paintings remaining from the 14th and 15th centuries. Sund Church is the biggest church in Aland.
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.