Danube Symphony with 1 Night in Budapest (Westbound)

Founded on a dragon's auspice in 1010 AD, Hanoi is Southeast Asia's most historically layered capital — a city where French colonial boulevards wrap around ancient temple islands and where the morning ritual of phở bò at a pavement stall carries the weight of a thousand years of tradition. Venture to Halong Bay's limestone karst seascape or explore the lantern-lit lanes of Hội An via nearby Chan May. October through April brings dry, pleasant weather ideal for exploring Vietnam's storied north.

Founded on a dragon's auspice in 1010 AD, Hanoi is Southeast Asia's most historically layered capital — a city where French colonial boulevards wrap around ancient temple islands and where the morning ritual of phở bò at a pavement stall carries the weight of a thousand years of tradition. Venture to Halong Bay's limestone karst seascape or explore the lantern-lit lanes of Hội An via nearby Chan May. October through April brings dry, pleasant weather ideal for exploring Vietnam's storied north.

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.

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.

Still whispered as Saigon by its ten million residents, Ho Chi Minh City pulses with an energy that outlasted every empire and every war. The French colonial grandeur of Notre-Dame Cathedral and Gustave Eiffel's Central Post Office stands in vivid counterpoint to the city's kinetic street life — an endless river of motorbikes, fragrant with pho broth and charcoal-grilled meats. Do not miss the Reunification Palace, a time capsule of Cold War modernism, or a dawn bowl of bánh mì from a sidewalk vendor. The dry season, November through April, offers the most comfortable conditions for exploration.