The Meuse citadels or Mosane citadels (French: Citadelles mosanes) are a group of forts situated along the Meuse river in southern Belgium. The citadels were originally intended to defend the Prince-Bishopric of Liège and County of Namur and were later modernized during the periods of French and Dutch rule. They include four citadels, at Namur, Liège, Huy and Dinant of which all are partially or totally preserved.
Meuse Citadels Wikipedia
On 8 April 2008, the citadels of Dinant, Namur and Huy were officially proposed as candidates to be UNESCO World Heritage Sites under the reference number 5365. After discussions, it was decided to propose Namur alone, possibly in combination with Dinant.