Fascinating Vietnam, Cambodia & the Mekong River (Northbound)

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.

Visegrád commands the Danube’s most dramatic bend from a hilltop citadel that once housed the Hungarian Crown Jewels and a Renaissance royal palace rivaling Italian courts. Must-dos include climbing to the Upper Castle for panoramic Danube Bend views, exploring King Matthias’s restored palace and Hercules Fountain, and tasting Hungarian gulyás with Etyek wines. Visit April through October, with autumn foliage adding golden drama to the sweeping river views.

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.

Krems an der Donau has stood at the eastern gateway of the Wachau Valley — Austria's most beautiful stretch of the Danube — since Emperor Otto III granted it market rights in 995 AD, making it one of the country's oldest documented towns. The UNESCO-listed Wachau landscape surrounding the city is a masterpiece of vineyard terraces, Baroque abbeys, and medieval castles reflected in the river; the Grüner Veltliner and Riesling wines produced here are among Austria's finest. Must-dos include visiting the monumental Melk Abbey and cycling the Danube Cycle Path through the valley. Krems is most enchanting April through October, with the harvest season in September offering wine cellar tastings of exceptional depth.

Châu Đốc is a mystical border town where the Mekong meets Cambodia, combining Vietnamese, Cham Muslim, and Khmer Buddhist cultures around the pilgrimage mountain of Sam (Núi Sam). Must-do experiences include visiting Sam Mountain's pagodas, touring floating fish farms, and tasting the town's famous bún cá turmeric fish noodle soup. November through April's dry season is most comfortable; the flood season reveals the delta's full hydraulic drama.

Grein, a picturesque port on the Danube River in Upper Austria, is known for its stunning architecture and rich history dating back to the 13th century. Must-do experiences include savoring local dishes like Greiner Knödel and visiting nearby attractions such as Dürnstein and Linz. The best season to visit is spring, when the landscape bursts into bloom and local festivities abound.

Engelhartszell an der Donau is a tranquil Upper Austrian village on the Danube, distinguished by Stift Engelszell — the country's only Trappist monastery, where monks have brewed acclaimed beers and crafted artisan cheese since the thirteenth century. Visitors should not miss a tasting at the abbey followed by a hike above the Schlögener Schlinge, the Danube's most dramatic horseshoe bend. Late spring through early autumn offers the finest conditions, when the river runs calm, the orchards are in bloom, and the monastery garden is at its most fragrant.