Laos is a Southeast Asian country traversed by the Mekong River and known for its mountainous terrain, French colonial architecture, hill tribe settlements and Buddhist monasteries. Vientiane, the laid-back capital, is the site of That Luang, a reliquary reportedly housing the Buddha’s breastbone, plus the Patuxai war memorial and Talat Sao (Morning Market), a shopping complex jammed with food, clothes and craft stalls.