Fascinating Vietnam, Cambodia & the Mekong River with Hanoi & Ha Long Bay (Southbound)

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.

Vukovar, Croatia's largest river port, sits at the confluence of the Vuka and Danube rivers, offering a rich historical narrative and vibrant local culture. Must-do experiences include savoring traditional dishes like fiš paprikaš and exploring nearby attractions such as Trogir and Solin. The best time to visit is in late spring and early autumn when the weather is pleasant and the local events are in full swing.

Novi Sad — the "Serbian Athens" — unfolds along the left bank of the Danube beneath the commanding walls of the Petrovaradin Fortress, a Habsburg military masterpiece whose underground tunnel labyrinth and hilltop clock tower (with hands reversed, to confuse enemy gunners) make for one of Europe's most unusual fortress visits. The city's elegant pedestrian street, the Zmaj Jovina, is lined with 19th-century Habsburg architecture that rewards a leisurely afternoon, while the Serbian cultural renaissance of the same era left behind museums, galleries, and coffee house traditions that endure today. In July, the EXIT music festival transforms the fortress into one of Europe's most storied outdoor stages. Visit May through September for the finest weather.

Ha Long Bay is a UNESCO World Heritage landscape of nearly two thousand limestone karst islands rising from emerald waters in Vietnam's Gulf of Tonkin. Must-dos include an overnight junk cruise through the karst formations, kayaking into hidden lagoons, and exploring the cathedral-scale Sung Sot Cave. October through April offers the best weather, with spring mist adding an ethereal quality to the already otherworldly scenery.

Belgrade, the 'White City' rebuilt at least forty times at the confluence of the Danube and Sava rivers, surprises every visitor with its raw, uncurated vitality — a capital that wears its turbulent history lightly while embracing the present with irresistible energy. The Kalemegdan Fortress, fortified for over two thousand years, offers the most dramatic river panorama on the entire Danube; below it, the Skadarlija cobblestone quarter fills nightly with kafana musicians and the aromas of Serbian rakija and roasted meats. Belgrade's nightlife — centered on the floating river clubs called splavovi — is genuinely legendary in Europe. Spring and early autumn offer the most comfortable conditions; the Iron Gate gorge is two hours downstream by river.

Golubac is a medieval fortress village on Serbia's Danube, where a magnificently restored fourteenth-century stronghold guards the entrance to the Iron Gates gorge — Europe's deepest river canyon. Visitors should explore the nine-towered fortress and sample *riblja čorba*, the local paprika-laced fish soup, at a riverside *kafana*. Late spring through early autumn offers the most rewarding conditions, with warm days ideal for both fortress ramparts and the lush trails of Đerdap National Park.

Vidin is a captivating port town on the Danube River known for its rich history, eclectic architecture, and vibrant local culture. Must-do experiences include exploring the Baba Vida Fortress and savoring local dishes like **kavarma** and **lutenitsa**. The best time to visit is during the spring and autumn months when the weather is pleasant and the local markets are bustling with activity.

Ruse, Bulgaria's elegant Danube gateway, surprises with a Belle Époque city centre of Austro-Hungarian grandeur — neoclassical facades, ornate fountains, and a Liberty Monument that would not look out of place in Vienna. The city serves as the gateway to the spectacular Rusenski Lom Nature Park, whose limestone canyon shelters medieval rock-carved monasteries of eerie beauty. The remarkable Basarbovo Monastery, still inhabited by monks, clings to cliffs above the turquoise river. Local wineries produce distinguished Mavrud and Cabernet from the nearby Danube plains. May through September offers the most pleasant temperatures for exploration.

Aswan, Egypt's sunniest city and its ancient southern frontier, offers the Nile at its most scenic — wide, blue, and studded with felucca-dotted islands where temples emerge from the water's edge like visions from another age. The Temple of Philae, rescued from the rising waters of Lake Nasser and reassembled on a new island, is a jewel of Egyptian antiquity; Elephantine Island harbors ruins spanning predynastic times to the Roman era. For the full pharaonic experience, a sunset felucca ride to the Aga Khan Mausoleum rivals any luxury on the Nile. October through April offers the most comfortable temperatures; Abu Simbel is a short flight south.

Oltenița is a historic Danubian port city in southern Romania where the River Argeș meets the Danube, offering visitors Chalcolithic archaeological treasures at the Gumelnița site and exceptional riverside dining featuring traditional Wallachian river fish cuisine. A must-do experience is savoring *saramură de crap* — Danube carp grilled over open flame — at a waterfront table, followed by a day excursion to the medieval citadels of Transylvania. The best season to visit is late spring through early autumn, when the Danube promenade comes alive and river cruise itineraries from Avalon Waterways, CroisiEurope, and Seabourn call at this understated gem of Muntenia.