Battle of Waterloo - Even if you don't think you're interested in battlefields, Waterloo is not to be missed. Walk up the Butte du Lion and look out over the scene of the battle. The excellent visitor's center has a movie that shows the battle in detail. Tip: Easy day trip from Brussels.

Abbaye de Villers-la-Ville - This old abandoned 12^th century abbey is what a ruined abbey should look like - decrepit, covered in vines, open to the sky and plenty of rooms to explore. A gem.

Le Grand Hornu (near Mons) - Le Grand Hornu is a coal mining town that's been made into a tourist site. This is a fascinating look into the Industrial Revolution, in a planned city where people worked and lived. Visit the mines, climb on slag heaps and tour these 19th century period houses.

Grotte de Han (Han-sur-Lesse) - The Grotte de Han is a huge limestone cave with spectacular stalagmites and stalactites. Truly memorable! Take the tram up to the cave entrance; then walk down through the cave, about 3km.

Chateau de Bouillon (Bouillon) - Visit the medieval fortress of Godefroy de Bouillon who went off to fight in the First Crusade. In the castle, be sure to see the Godefroy de Bouillon room, hollowed out of the rock, with a large cross carved in the floor.

Gorge de Loup (Echternach, Luxembourg) - This corner of Luxembourg is know as Luxembourg's "Little Switzerland" because of its amazing rock formations, caves and gorges. Visit the Gorge de Loup - there are well marked footpaths and you can take little kids on this walk.