bxl-forever
There are 4 museums, each with its own website and branding itself on a separate museum, though they actually are 4 separate parts within this whole area.  But they have the same entrance, just behind Royale/Koning tram stop.

Those are the 4 museum nodes you see next to each other near Rue de la Régence/Regentschapsstraat.

1) Musées royaux des Beaux-Arts de Belgique - Koninklijke Musea voor Schone Kunsten van België
2) Musée Fin de siècle - Fin de siècle Museum
3) Musée Oldmasters - Oldmasters Museum
4) Musée Modern Museum

The 4 other logos, inside building structures, are a mistake.  Somebody apparently wanted to get rid of the former amenity=public_building tag and changed all of them into tourism=museum, which is incorrect without proper tags (names, and so on).  I removed those useless tags.