The Danube beautifully showcases both past and present on this majestic journey between two medieval masterpieces. Take your first step back in time with a fascinating secret that lies below Budapest’s Castle Hill. Then, get a glimpse into the world of an imperial family at Vienna’s Schönbrunn Palace. Along the way, you’ll hike, bike, play in a giant toy museum and pass through a modern engineering marvel—the Main-Danube Canal. Your voyage may end at the centuries-old Prague Castle, but the memories will live forever.