Probably one of the smallest WH sites, but when you're in Brussels, you will get there anyway, and it is a very impressive place. Not really as big as the name would imply, the Grote Markt /Grand-Place, to be linguistically correct in the Belgian way, this collection of medieval/ Renaissance houses, especially the City Hall, is still outstanding, especially when you can enjoy great Belgian food and drinks in one of the little alleys nearby. Eating mussels and fries and watching the guild houses lit up at night cannot be easily beaten in terms of joie de vivre.