You can learn about the local history of Cologne when you make a stop at a top site like Cologne Cathedral. Stroll along the riverfront in this culturally rich area, or seek out the local tours.
Learn about the events happening at Messe Düsseldorf during your trip to Düsseldorf. While you're in the area, find time to visit its shops.
Catch an event at Signal Iduna Park during your trip to Dortmund. You can attend a sporting event while in the area.