Europe's winding rivers, from Portugal's Douro to Germany's Rhine and France's Rhône, are some of the most scenic in the world. And river cruises mean visits to castles and vineyards, with time to explore UNESCO heritage sites as well as European capitals. The options can feel overwhelming. To help, we've collected our 10 favorite European river itineraries. Feeling indecisive? Many of these rivers connect, and longer itineraries can cruise two or even three waterways in one route.