The pavilion is a one floor, horizontal structure resting on eight steel pillars that support the weight of the flat roof. There is no enclosed space, nor doors, and there is almost no separation between the interior and exterior.Pure and simple geometry dominate the building.

Glass walls, green marble, golden onyx from the Atlas Mountains, Roman travertine, cement, steel, chrome and water were the 'ingredients' used by Ludwig Mies van der Rohe to design a building with remarkably austere but expressive qualities.

This singular structure was built for the Universal Expo of 1929 in Barcelona. Mies Van der Rohe's German Pavilion was a "modern coup" amid the sumptuous Noucentisme buildings that defined the development of Montjuic.

Despite being conceived as an ephemeral building (it was dismantled once the Expo was over), it existed long enough to become a benchmark of the rationalist architecture movement (during the 1920s and 1930s ). So much so that in 1954, on the 25th anniversary of the exhibition, the architect Oriol Bohigas pushed for the pavilion's reconstruction. This became a reality after more than 30 years, in 1986.