Hạ Long Bay, in northeast Vietnam, is known for its emerald waters and thousands of towering limestone islands topped by rainforests. Junk boat tours and sea kayak expeditions take visitors past islands named for their shapes, including Stone Dog and Teapot islets. The region is popular for scuba diving, rock climbing and hiking, particularly in mountainous Cát Bà National Park.

Hanoi, the capital of Vietnam, is known for its centuries-old architecture and a rich culture with Southeast Asian, Chinese and French influences. At its heart is the chaotic Old Quarter, where the narrow streets are roughly arranged by trade. There are many little temples, including Bach Ma, honoring a legendary horse, plus Đồng Xuân Market, selling household goods and street food.

Hong Kong is a special administrative region of China. Situated on China's southern coast just south of Shenzhen, it consists of Hong Kong Island, Kowloon, and the New Territories. With 7.5 million residents in a 1,114-square-kilometre territory, Hong Kong is the fourth-most densely populated region in the world

Sapa is a famous mountain destination in northwestern Vietnam, known for its misty peaks, stunning terraced rice fields, and vibrant ethnic minority cultures.

Siem Reap, a resort town in northwestern Cambodia, is the gateway to the ruins of Angkor, the seat of the Khmer kingdom from the 9th–15th centuries. Angkor’s vast complex of intricate stone buildings includes preserved Angkor Wat, the main temple, which is pictured on Cambodia’s flag. Giant, mysterious faces are carved into the Bayon Temple at Angkor Thom.

Phnom Penh, Cambodia’s busy capital, sits at the junction of the Mekong and Tonlé Sap rivers. It was a hub for both the Khmer Empire and French colonialists. On its walkable riverfront, lined with parks, restaurants and bars, are the ornate Royal Palace, Silver Pagoda and the National Museum, displaying artifacts from around the country. At the city’s heart is the massive, art deco Central Market.

Bangkok, Thailand’s capital, is a large city known for ornate shrines and vibrant street life. The boat-filled Chao Phraya River feeds its network of canals, flowing past the Rattanakosin royal district, home to opulent Grand Palace and its sacred Wat Phra Kaew Temple. Nearby is Wat Pho Temple with an enormous reclining Buddha and, on the opposite shore, Wat Arun Temple with its steep steps and Khmer-style spire.