I'm headed to Belgium soon.
I thought while I was there I'd go see some Caves or Gorges --
I can't find anything that's a standout --
Anyone have recommendations?
The caves of Han near Han sur Lesse and Remouchamps are well known. The first belongs to the largest in Europe, a tour takes about 1½ hour there. How interesting they are depends on your experiences and expectations.
Not so familiar with gorges, but between Namur (Namen in Flemish) and Huy (Hoei) along the river Meuse (Maas) there are cliffs, not directly spectacular but much visited by climbers. There are more places, hopefully the TI in Namur can help you: https://www.namurtourisme.be/en/bon-a-savoir/nous-contacter/