Explore the historical city of cologne at your leisure with this hop on hop off bus tour and rhine river sightseeing cruise with a ticket valid for 24 hours see top cologne attractions such as cologne cathedral klner dom the city hall and the old town altstadt and hop on and off the open top bus at any of the 16 stops to create your own personalized sightseeing itinerary complement your bus tour with a 1 hour rhine river cruise to witness the medieval citys intricate skyline and stunn