You have until 18 May 2014 to see works by Andy Warhol at the Ludwig Gallery in Oberhausen Palace. The exhibition focuses on prints from Warhol's early years. Highlights include the Campbell's soup can and portraits of Marilyn Monroe and Mao Zedong.
The Ruhr region is home to a number of museums that merit a visit. The Zeiss Planetarium and the German Mining Museum in Bochum are well worth seeing, as is the Ruhr Museum in Essen, which documents the history of mining in the region. A must for art fans, meanwhile, is the Folkwang Museum.