Explore 10 unique destinations along the Danube River—bustling capitals, fairytale towns, historic fortresses, and scenic valleys. This guide highlights must-see stops like Budapest, Vienna, Bratislava, Belgrade, Dürnstein (Wachau), Passau, Regensburg, Linz, Vukovar, and the Iron Gates—perfect for first-time river cruisers and repeat explorers wanting culture, castles, and riverside charm.