Make sure you have a full tank of gas, because Cologne is worth a detour. Situated 45 miles from Hachenburg, it offers some terrific attractions, such as Cologne Cathedral and RheinEnergieStadion. Düsseldorf, 60 miles away, is another destination that’s worth the drive. Swing by Rhine Tower and Duesseldorf City Hall, two must-see sights in the area.