See Bucharest’s 3,000-room Palace of Parliament. Make banitsa bread with a home cook in Vidin. Explore Belgrade’s Ottoman and European treasures, including the 6th-century Kalemegdan Fortress. View the Danube’s towering Iron Gate. Witness Hungary’s daredevil Puszta horsemen. Behold Budapest’s grandeur. Once hidden behind the Iron Curtain, the eastern Danube still has secrets to reveal on this enriching cruisetour.