Monschau Castle is first recorded in 1217 as castrum in Munjoje by Archbishop Engelbert I of Cologne. It was expanded in the middle of the 14th century into a fortress for the counts of Jülich and equipped with mighty ring walls and wall walks. In 1543 troops of Emperor Charles V besieged the site with heavy guns, captured it and plundered it together with the town of Monschau.
In the early 19th century the French administration declared the castle to be state property and sold it to a private buyer who had the roofs removed in 1836 and 1837 in order to avoid building tax. As a result, the castle fell into ruins until, in the early 20th century, the government of the Rhine province secured and repaired it. After the First World War a youth hostel was opened in the west wing. So Monschau Castle survived as a 'youth castle' (Jugendburg).
Within sight of the castle, on the other side of town, is another fortification, the Haller. It is disputed as to whether it was an outpost of the castle, a detached watchtower or the remains of an older castle site.
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.