The 21er Haus was built in 1958 by the Austrian architect Karl Schwanzer as a pavilion or temporary showroom for the Universal Exhibition in Brussels. In the same year Schwanzer won the Grand Prix d´Architecture for his visionary and technologically innovative design. From 1962 to 2001 the building served as an exhibition hall for the Museum of Modern Art until its collection was moved to the Museum of Modern Art - Ludwig Foundation in Vienna’s new MuseumsQuartier. In 2002 the 21er Haus was incorporated into the Belvedere museum. During the past few years the building was adapted to the purposes of a modern museum and finally reopened last week.