The banks of the Danube are soaked in history, having witnessed the rise and fall of countless empires. Today, within the cities along the Danube, the past remains visible in stunning clarity. An imperial glow is embedded within the very masonry of capitals like Vienna and Budapest. One stands at the footsteps of the Hofburg Palace or the Hungarian Parliament and senses how it must have felt to be a provincial subject from some far-flung corner of the empire, awestruck by their imperial grandeur. The Danube has retained this aura of historic wonder and it flows like a gateway into the past for all travelers who tread its banks.