If you’re up for a little more adventure, keep on cruising to Cologne, 50 miles from Sundern. You’ll find plenty more fabulous things to experience here, such as Cologne Cathedral and RheinEnergieStadion. Düsseldorf is another destination to keep your eye on. It’s situated just 55 miles away. If you venture out this way, Rhine Tower and Duesseldorf City Hall should be top of your itinerary.