In 1925 Silvio della Valle di Casanova donated his collection to the city and the Cube was built in 2005 to become the bad boy of the Stuttgart art world – very glass, very modern and with automatic doors the Heart of Gold would be proud to boast. Otto Dix joins myriad modern art (including a balled up bit of paper) on the two permanent floors. The other three are for special exhibitions such as Luminous Buildings: Architecture of the Night (9 Jun - 1 Oct). Guided tours on Wednesdays at 18:00 and Sundays at 15:00.