Aggsbach Charterhouse is a former Carthusian monastery in Aggsbach Dorf. The monastery was founded in 1380 by Heidenreich von Maissau. It was dissolved in 1782 in the reforms of Emperor Joseph II. The premises were mostly converted for use as a castle, except for a few portions which were incorporated into the parish priest's farm. The monks' cells and the cloister were demolished. The Carthusian church, with the addition of a tower, remains as the parish church.
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.