Photo: GetYourGuideThis hop-on, hop-off bus loops the sights of Cologne, from the cathedral and the old town to the Chocolate Museum, the Rheinauhafen and the shopping streets, letting you jump off and on across the day with commentary on board. It is a handy way to cover a lot of ground. Grab a seat up top for the views, plan your hop-offs around the sights you most want, and keep the ticket for the whole day.