On a Danube cruise, you'll stop in Vienna, seen here from the top of St. Stephen's Cathedral.
The gorgeous library at Melk Abbey, in Austria, an unforgettable stop of your Danube cruise.
Vienna's iconic Freyung passage is a popular market.
The jaw-dropping Parliament Building overlooking the Danube in Budapest, Hungary.
One of Budapest's teeming public markets.
A beautiful springtime view of the exterior of Austria's historic Melk Abbey.
On an Elbe cruise, don't miss the rooftop of the Reichstag, or Parliament Building, in Berlin, which features a memorable cafe.
One of the many beautiful cityscapes you'll see on an Elbe cruise: Prague, including the Franz Kafka Museum and Petrin Hill.
Dresden, another popular stop on an Elbe cruise, includes the stately Theaterplatz, Hofkirche, and the Castle.
Another must-see on an Elbe cruise: the Old Masters Picture Gallery at Dresden's Zwinger Palace.
A statue of Mercury at the magnificent Sanssouci, built to rival Versailles, in Potsdam, outside Berlin.
A panoramic view of Berlin from the Elbe.
A Rhine cruise includes a stop in Heidelberg, where visitors stroll past the beautiful Church of the Holy Spirit, in Market Square.
There's a vibrant cafe scene in Heidelberg's Market Square.
Rhine cruisers find that the trams in Basel, Switzerland, are fun and efficient.
Construction of the imposing cathedral in Cologne, Germany, began in the 13th century; the structure is one of the sights on a Rhine cruise day tour.
An elegant medieval bridge in Strasbourg, in the Alsace region of France, one of the stops on a Rhine cruise.
Classic half-timbered houses in Alsace.
The uplifting interior of Heidelberg's Church of the Holy Spirit.
On a Rhone cruise, you'll visit the gargantuan Palais des Papes, in Avignon, France.
One of the many inspiring chambers inside the Palais des Papes in Avignon.
The Church of St. George is a charming Rhone-side attraction in Lyons.
The entrance to the Vincent van Gogh Foundation building, a surprisingly contemporary structure on the Rhone.
A statue of St. George atop Notre Dame de Fourviere, in Lyons.
Van Gogh's painting "Cafe Terrace at Night" famously depicts a cafe in the Place du Forum, in Arles, a stop on a Rhone cruise, where cafes still beckon visitors today.
Paris is the beginning and end of most Seine cruises. Here, the Louvre Museum as seen from the river.
The famous white cliffs at Etretat in the Normandy region of France, where the Seine meets the sea.
The banks of the Seine are transformed in summer into the "Paris Beach."
No Seine cruise is complete without a photo op of the Eiffel Tower, seen here with a local tour boat on the river.
A painting workshop in Giverny, a stop along the Seine where Claude Monet famously painted his water lilies and other iconic Impressionist images.
The unforgettable Trouville-sur-Mer beach promenade in Normandy.
The beaches and cliffs of Etretat, Normandy.