This museum soon became one of the most important contemporary art museums in Spain and the world. Apart from its temporary exhibitions, it has permanent works by Julio González, Ignacio Pinazo, Miquel Navarro, Joan Cardells and numerous 20th century avant-garde artists. It also has an interesting photographic background (Robert Capa, Renau, Man Ray, etc.).

In its basement, in the so-called Room of the Wall, a section of the Christian wall from the 14th century is preserved.