 The remarkable Gallery building, designed by the architect Ferdinand Dutert consists of two floors which are sorted in three levels (ground floor, first floor and second floor) and its surface area is approximately .The gallery, made of stone and metal, is almost long, the facades are decorated with sculptures inspired by naturalists and large windows afford abundant natural light.Originally, the second floor (two rooms and the mezzanine over the first floor) was occupied by the Anthropology collections, but in 1937 these collections migrated to the new "musée de l'Homme".