From Vienna to Istanbul, and countless treasures in between, touch history in Austria, Hungary, Croatia, Serbia, Bulgaria, Romania and Turkey as you sail along the exotic lower Danube. Celtic fortifications, medieval towns and grand cities, along with the natural beauty of pastoral landscapes and the Danube’s famed Iron Gates, showcase the best of eastern Europe. Nature lovers will relish the opportunity to see Bulgaria’s natural wonder, Belogradchik, a fairytale stone world of fantastic shapes associated with interesting legends; or to bike through Belgrade’s sprawling Kalemegdan Park. Wine connoisseurs will have a chance to taste history from the centuries-old wine-growing hills dating back to the Romans in Ilok, a royal and vinous town. Be treated to the flavors, sights, sounds and cultures of this diverse swath of the continent. And the active adventurers will appreciate hiking to the UNESCO-designated Ivanovo Rock Hewn Churches and biking through Belgrade’s Kalemegdan Park and Vidin’s Baba Vida castle. Be treated to the flavors, sights, sounds and cultures of this diverse swath of the continent.