The Sprengel Museum is held in extremely high esteem, both for the design of the building as well as for the art housed inside. Its huge interior spaces are perfectly suited to displaying its modern figurative, abstract and conceptual art, including a few works by Nolde, Chagall and Picasso. At the core of the collection are 300 works by Niki de Saint Phalle, a selection of which is usually on show. Check the website for visiting exhibitions.
Take bus 100 from Kröpcke station to the Maschsee/Sprengel Museum stop.