Domaine des Grottes de Han has 4 major places to visit, that paint the whole picture of the region - Caves of Han for the geology inside the caves, Parc Animalier (Animal Park) for the wildlife biology (incl Belvaux Chasm, a geological curiosity that's the inspiration behind the logo of Famenne Ardennes UGGp), Han 1900 for anthropology a century ago and PrehistoHan for the archaeology and studies about prehistoric humans & nature in this region.
Very close to Wellin are 2 of the beautiful places in Belgium - Sohier & Froid Lieu, 2 more of the 30 plus beaux villages de Wallonie.
C. Very close to Tellin is the town Resteigne (one more of the plus beaux villages de Wallonie) which has a chateau & an abandoned quarry, but the main point is the between the 2 towns which lend a gorgeous panoramic view of river Lesse.
My idea is to go here on a 3-day trip, hopefully coming Spring, with Wellin as the base - a day for Wellin (incl Lavaux Saint Anne & Revogne - a 20km cycling loop), a day for Tellin & a day for Euro Space Centre.