You can study the exhibits at Ruhr Museum, a museum with a storied past, during your trip to Essen. Take in the theater scene while you're in the area.
Zollverein Coal Mine World Heritage Site is just one of the attractions in Stadtbezirke VI, Essen so you might want to stop by during your trip. If you want to experience more of the culture Essen has to offer, head to Red Dot Design Museum, University of Duisburg-Essen, and Philharmonie Essen.