Rivers are the foundation of any society. For example, some of the famous rivers are Cairo is on the banks of the Nile River, Baghdad on Tigris, London on the banks of the Thames River, Paris on the banks of the Seine River, and New York on the Hudson River. Anything that has to do with rivers can be very romantic, whether it can be a spa on a river's banks or a cruise. There are all sorts of rivers in the world, but this article is about the world's most beautiful rivers–after all, it's these rivers that build romantic travel opportunities. Most of the famous rivers mentioned below have river cruises, and if you don't find any, a resort on the banks of these remarkable rivers can be just as great.