Be sure to have plenty of gas in the tank, because Cologne is worth a detour. Situated 25 miles from Marienheide, it boasts some terrific attractions, such as Cologne Cathedral and RheinEnergieStadion. Get set to start clocking up those miles, because Rhine Tower and Duesseldorf City Hall are also worth a day trip. You’ll find these popular sights in Düsseldorf, 35 miles away.