The 21er Haus is a modern and contemporary art museum focusing on Austrian art in an international context. Built for the 1958 World Exhibition, the building’s modern architecture with light-flooded open spaces demands equal attention. Part of the Belvedere Castle and Museum since 2011, the museum hosts performative interventions, film screenings, lectures, concerts, and artist talks. 21er Haus’ cafe-restaurant, TWENTYONE, supplements the museum as a performance and meeting space for art and culture.