The Citadel of Namur is a fortress in the Walloon capital city of Namur, at the confluence of the Sambre and Meuse rivers. It is originally from the Roman era, but has been rebuilt several times. Its current form was designed by Menno van Coehoorn, and improved upon by Vauban after the siege of 1692. It has been classified as a Wallonia Major Heritage site. Its highest point sits at 190 metres. Together with those at Dinant, Huy and Liège, the Citadel of Namur forms part of the so-called Meuse Citadels.
The original citadel dates to 937. It achieved its present extent between 1631 and 1675, when the city was under Dutch control. This section was called "Terra Nova" to distinguish it from the smaller Médiane fort built adjacent in 1542 and ensuing years.
Wikipedia https://en.wikipedia.org/wiki/Citadel_of_Namur
Official Website https://citadelle.namur.be/
Address (Unnamed Road), Namur 5000, Belgium
Coordinates 50°27'35.123" N 4°51'43.361" E