Cruise along the Rhine—Germany on one side, France on the other. Discover Alsace, whose dual French and German heritage has given it fabulous food and a winemaking tradition that goes back to the Romans. Marvel at castles that were once mighty fortresses and get an insider’s look at one of the only castles on the Rhine that has never been destroyed, Marksburg Castle. Visit historic cities, including ancient Cologne and picturesque Strasbourg; stroll through the fairytale town of Rüdesheim; and taste delightful white wines in the villages where the grapes are grown.