Explore Vienna at your own pace on board a hop-on hop-off bus. You'll see all the major sights, from the Hundertwasser House, the Prater, St. Stephan's Cathedral and Schönbrunn Palace. Stops throughout the city allow you to get off the bus to see what you're interested in and get back on the next trip with the same ticket, while a multilingual audio guide tells you the story of the sights you see along the way.