 The Kunsthalle's own collection comprises around 1,500 works by artists including Édouard Manet, Paul Cézanne, George Grosz and Wassily Kandinsky.The extension building from 2018 shows a major collection of works by Anselm Kiefer, 38 pieces on long-term loan from the businessman Hans Grothe.Designed by Hermann Billing, the building was erected as a temporary structure to serve an "International Art Exhibition" of 1907, commemorating the 300th anniversary of the foundation of the city.