Brüggen Castle was the most important castle in the north of the Duchy of Jülich. The castle was built by the Count of Kessel in the 13th century to guard a ford over the River Schwalm. In the early 14th century it went into the possession of the dukes of Jülich, who had the existing building replaced by a quadrangular castle made from brick. After the occupation of Brüggen in 1794 by Napoleonic troops it was confiscated and resold by the French government to a private individual at the beginning of the 19th century. Today part of the castle houses a hunting and natural history museum.
References:The Citadelle of Quebec is an active military installation and official residence of both the Canadian monarch and the Governor General of Canada. It is located atop Cap Diamant, adjoining the Plains of Abraham in Quebec City. The citadel is the oldest military building in Canada, and forms part of the fortifications of Quebec City, which is one of only two cities in North America still surrounded by fortifications, the other being Campeche, Mexico.
The first fortifications in Quebec were built by the Governor General of New France Louis de Buade, and completed just in time for the Battle of Quebec in 1690.
After the British conquest in the second half of the 18th century, the problem of Quebec City's defences grew more acute.