If you’re eager for a little more adventure, keep on cruising to Cologne, 16 miles from Bonn. You’ll find plenty more wonderful things to see and do here, including Cologne Cathedral and RheinEnergieStadion. Düsseldorf, 35 miles away, is another road-trip destination that’s worth the drive. Visit Rhine Tower and Duesseldorf City Hall, two popular sights in the area.