Monks walk in the streets of Luang Prabang, Laos, June 3, 2013. Luang Prabang, the capital of Luang Prabang Province, is a small peaceful city in northern Laos, at the confluence of the Nam Khan river and Mekong River. With a more than 1,000 years history, Luang Prabang was listed by United Nations Educational, Scientific and Cultural Organization (UNESCO) as a world heritage in 1995. (Xinhua/Chen Duo)