Manoir de Lebioles, a castle-hotel in the forested Ardennes region.
Château de Jehay --possibly one of Belgium's most enchanting castle, with a moat and lovely gardens.
Bouillon Castle and Fort is in Luxembourg Province in the south of Belgium. It's great to visit with kids--falconry, summer festivals, medieval guides, etc.
Chateau de Modave, built in 1658.
Beloeil Castle Castles & Chateaux - The Belgian Tourist Office
Gravensteen Castle in Ghent.
Chateau de Lavaux-Sainte-Anne près de Rochefort, dans la province de Namur Belgique 50.115,5.091