The Belvedere 21 is one of Austria’s most important buildings of the post-war era. The Pavillion received a prize at the 1958 World’s Fair in Brussels. Subsequently transferred to Vienna, it was reopened as a museum of the twentieth century in 1962. In the immediate vicinity of the Belvedere and at the center of a burgeoning new neighborhood, the Belvedere 21 continues to follow its guiding principle as a connecting bridge, both structurally and symbolically. This tour offers a concise overview of the museum’s architecture and history.