Opening to the public of the Hotel van Eetvelde and his extension, a jewel of Brussels’ Art Nouveau, classified as a Unesco World Heritage Site, with an offer of guided and free visits. Access is made possible through the LAB-An or Art Nouveau Laboratory, a space for the promotion of Art Nouveau that offers a contemporary look at this Belgian and Brussels heritage and the themes it encompasses. In addition, there is a reflection on the conservation of our Art Nouveau heritage through the rebirth of the Aubecq Hotel and an introduction to the links between Art Nouveau and Belgian colonization.