Aerial photo taken on Feb. 20, 2017 shows the view of Vang Vieng, Laos. Vang Vieng is a popular tourist destination in Laos, famous for its karst landscape scenery. (Xinhua/Liu Ailun)
Aerial photo taken on Feb. 20, 2017 shows the view of Vang Vieng, Laos. Vang Vieng is a popular tourist destination in Laos, famous for its karst landscape scenery. (Xinhua/Liu Ailun)