If you’re in the mood for more adventure, keep on driving to Cologne, 45 miles from Plettenberg. You’ll find plenty more fascinating things to see and do here, including Cologne Cathedral and RheinEnergieStadion. Düsseldorf, 50 miles away, is another road-trip destination that’s worth the journey. Stop by Rhine Tower and Duesseldorf City Hall, two great attractions in the area.