In central Huy, about 100 kilometres southeast of Brussels, is a citadel/fort strategically located next to the Meuse river. The citadel was built between 1818 and 1823 and has throughout history served as a prison for various political prisoners. During the Second World War between May 1940 and September 1944, the fort was used by the germans to imprison political prisoners or people suspected of anti-German activities. During the war, about 7,000 prisoners of different nationalities passed through the fort, for many it became a stop on the way to some other prison or camp.

Current status: Preserved with museum (2022).

Location: 50°31' 02.94" N 05°14' 14.44" E

Get there: Car.

My comment:

The Citadel is beautifully situated on a hill in Huy and from its top you have a view of the city and its surroundings. The museum is quite simple in its design with preserved cells and other rooms and it was larger than I had expected.

Follow up in books: Kogon, Eugen: The Theory and Practice of Hell: The German Concentration Camps and the System Behind Them (2006).