In many cities, graffiti is seen to be a nuisance. In others, it is an art form to be celebrated. Such is the case in Brussels — home of the comic, Tintin, Asterix and many others.
Some of the “official” ones, which appear on tourist maps, include:
But there are many “unofficial” ones to be found. One just needs to keep one’s eyes open.
For more information on the comic book route, see http://www.brussels.be/artdet.cfm?id=5316