Belgium is the cradle of 20th century comics, called BD (Bande dessinée) in Brussels. It’s an important part of the culture of this country; nowhere in the world can you find so many comics shops.
Brussels has a “Museum de la Bande Dessinée” but what has always fascinated me is the open air tribute to comics.
All through the city center you will see plenty (more than 30!) of murals showing your favourite characters. Some of them interact with Brussels landmarks (i.e. the Manneken Pis), others perfectly fit the wall they are painted on (Boulevard d’Anspach, close to La Bourse). You will be surprised by seeing them around many corners in the center!
But if you prefer discovering these beauties yourself, then check this website. It makes it easier to understand which comics are where in town.
There are some which are so well integrated with the city that you do not even realize they are there.
Have a good walk, and let me know!