The Legendary Danube

Nuremberg commands the imagination on two levels: as the glittering medieval city where Holy Roman Emperors held court, Albrecht Dürer was born, and craftsmen produced the first pocket watch — and as the site of the 20th century's darkest chapter, where Nazi rallies and subsequent war crimes trials left permanent marks on European history and conscience. The Kaiserburg castle crowning the hill above the perfectly preserved old town offers sweeping views of a cityscape that, despite wartime bombing, remains one of Germany's most beautiful. The Documentation Centre on the former Nazi Rally Grounds is essential, sobering history; the Christmas Market on the Hauptmarkt, held since 1628, is among Europe's finest. Visit May through October or December.

Regensburg, Bavaria's medieval masterpiece on the Danube, is one of Central Europe's most intact ancient cities — its Roman origins visible in the Porta Praetoria stone gate, its medieval prosperity celebrated in the soaring twin towers of St. Peter's Cathedral and the twelfth-century Stone Bridge. UNESCO World Heritage status acknowledges a skyline dotted with patrician towers, while the famous Historische Wurstküchl, Germany's oldest operating sausage kitchen, has been serving spit-grilled bratwurst since the 1140s. The surrounding hills produce excellent Bavarian whites. May through September offers the most convivial riverbank atmosphere.

Passau occupies one of Central Europe's most dramatic natural stages — a narrow peninsula at the confluence of three rivers, the Danube, Inn, and Ilz, where the old town's baroque spires and shuttered merchants' houses crowd the very tip of the land between the waters. St. Stephen's Cathedral houses the world's largest church organ, a 17,974-pipe instrument whose daily concerts fill the nave with a sound that seems architectural in its density. The Veste Oberhaus fortress above the city commands panoramic views across three countries on clear days. Passau is a classic Danube river cruise departure point; spring and early autumn, when the river runs high and the light turns golden, are the finest seasons.

Austria's third city has accomplished one of Europe's most convincing urban transformations — reinventing itself from industrial centre to cultural powerhouse, a journey recognised in 2009 when it was named European Capital of Culture. The Ars Electronica Center, a museum of digital art and technology that glows with LED light across the Danube each evening, epitomises Linz's forward-looking identity. Yet the city's Roman roots, its baroque Hauptplatz (one of Austria's finest main squares), and its proximity to the Wachau Valley anchor it firmly in history. The Upper Austrian cuisine — particularly Linzer Torte, the world's oldest-documented cake recipe — is exceptional. Linz is most agreeable May through September.

Melk Abbey is among the most theatrical expressions of Baroque ambition in all of Europe — a gilded monastery perched on a granite outcrop above the Danube, its domed church and frescoed library presiding over the Wachau Valley with serene authority since Benedictine monks replaced the Babenberg fortress in 1089. Umberto Eco immortalised it as the inspiration for his labyrinthine monastery in "The Name of the Rose," and the library's 100,000 medieval manuscripts remain one of the continent's supreme collections. After the abbey, stroll down to the historic market town and sample the valley's celebrated Grüner Veltliner wines. The Wachau is at its most bewitching in April and October.

The port of Vienna is a cultural gem along the Danube River, famous for its stunning architecture, rich history, and vibrant culinary scene. Must-do experiences include sampling authentic Wiener Schnitzel and visiting the picturesque village of Dürnstein. The best season to visit is spring or early fall, when the city's gardens bloom and outdoor activities abound.

The Wachau Valley is a UNESCO-listed stretch of the Austrian Danube between Melk and Krems, where steep vineyard terraces, apricot orchards, and medieval villages create one of Central Europe's most refined cultural landscapes. Visitors should not miss the Baroque grandeur of Melk Abbey and a tasting of Smaragd-classified Grüner Veltliner at a riverside Heuriger. The valley is at its most captivating from late May through October, with the apricot harvest in June and the golden vineyard colours of early autumn offering two particularly luminous windows.

Budapest, divided by the Danube into the hilly Buda of thermal baths and medieval castle lanes on one bank and the grand Pest of coffee-house culture and Art Nouveau splendor on the other, delivers the most theatrical first impression of any European capital — whether approached by river as the neo-Gothic Parliament materializes from the water or by night from the Citadella's sweep of illuminated panorama below. The city's celebrated thermal bath culture, rooted in Ottoman-era hammams and perfected in palatial Secession-era pools like the Széchenyi, is an experience entirely unlike anything else in Europe. Visit spring and autumn for comfortable temperatures; Vienna is two and a half hours west by train.