And don't forget to see the Manneken-Pis:
"The famous Manneken-Pis remains the emblem of the rebellious spirit of the City of Brussels. His wardrobe counts more than 800 suits. The Museum of the City of Brussels presents one hundred of these suits. A multimedia database allows the visitors to consult the whole wardrobe of the famous 'ketje'."
http://www.brussels.be/artdet.cfm/4328