"Twenty years from now you will be more disappointed by the things you didn't do than by the ones you did do.
So throw off the bowlines, sail away from the safe harbor. Catch the trade winds in your sails."
- Mark Twain
The Rhine is one of Europe's greatest rivers, beginning in the southwest Swiss Alps, then flowing through the Rhineland and eventually emptying into the North Sea in the Netherlands. The Rhine Valley contains some of the most famous medieval castles, fortresses, and palaces in Europe, some reincarnated as hotels.