Belvedere 21 is a thriving arts and meeting space within Vienna's urban futurism district, and the building is an architectural symbol of post-war modernity; Initially designed by Karl Schwanzer as the Austrian pavilion for the 1958 World's Fair in Brussels, it was later adapted for museum purposes and opened in 1962 as a museum under the name of the 1920s House (20er Haus) until it was changed in 2018 to Belvedere 21.