Venture along the legendary Rhine—home to more castles than anywhere on earth—and take in its storybook scenery. Watch the world go by on France’s picture-perfect canals. Spend the day at a Bavarian amusement park and giant toy museum. And if you still haven’t felt the history on all the charming cobblestone streets, Prague’s 600-year-old clock will let you travel back in time. This multi-country adventure is one family outing you’ll be talking about for decades.