In reply to jungle:
Freyr is the big crag and very well-known - near Dinant as above. IMHO, it used to be better when it wasn't fully bolted, but that's going back many years. Well worth a visit. Clib Alpin Belge hut and camping at the top.
Nideggen is just over the border into Germany, but if you want something completely different it's thoroughly entertaining - sort of conglomerate with pebbles. the question is - which pebble has the hold behind it? Chalk spoils that instantly