Moon Crescent Spring, a unique tourist attraction in the desert of Dunhuang, Northwest China's Gansu Province. About over 100 meters long and 25 meters wide, the Crescent Moon Spring is surrounded by the Mingsha Mountain. It is appraised as "Unique Scenery in the north of Great Wall", and listed as National Key Tourist Attractions of the People's Republic of China in 1994. [Photo by Zhiyuan / China.org.cn]