The River Cruise Departs July 3, 2023. Admire Rhine Valley vistas from a 900-year-old castle. Sample the food and wine of Austria's Wachau Valley. Learn the Viennese waltz and linger in Budapest's Café Gerbeaud. Indulge all your senses on this 15-day journey spanning the best of Europe. Viking's most iconic itinerary traces the Rhine, Main and Danube Rivers between the windmill-dotted waterways of Holland and the stunning landscapes of Hungary, with engaging encounters at every bend.