Enjoy two nights in Paris, the �City of Lights,� before setting sail along four of Europe�s most beautiful rivers�the Moselle, Rhine, Main, and Danube. Delight in the astounding beauty of the Wachau Valley, and marvel at the variety of architectural styles to be found in just one region�and often in a single building. This trip lets you explore the archetypal Medieval cities of Nuremberg, Regensburg, and Rothenburg; the imposing 900-year-old Baroque Melk Abbey; and Passau�s beautiful cathedral, home to the largest pipe organ in Europe.