"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 heart of Europe is central Europe, and includes countries such as Hungary, Slovakia, Austria, Poland, and the Czech Republic. Cruising famous rivers such as the Danube is just one way to see some of the best preserved ancient cities, abbeys, and castles on the continent.