Located 45 miles from Siegen, Cologne is a popular stop on many people’s road-trip itineraries. Make your way here to access Cologne Cathedral and RheinEnergieStadion, two excellent attractions to mark on your map. Get set to start racking up those miles, because Rhine Tower and Duesseldorf City Hall are also a rewarding day trip. You’ll discover these popular attractions in Düsseldorf, 60 miles away.