Amsterdam to Basel with impeccable, personalized service, Viking River Cruises’ Longships are floating luxury hotels offering all the amenities and service of a five-star resort. Our seven-day itinerary traversed four countries from Amsterdam to Basel and featured the cities of Kinderdijk, Cologne, Koblenz, Rudesheim, Heidelberg, Speyer, Strasbourg, and Breisach. If you decide to extend your …