Tourists visit the Mogao Grottoes in Dunhuang, Gansu. [Photo/CHINA DAILY]

The Mogao Grottoes contribute greatly to Dunhuang's unique culture. The grottoes, one of the world's largest sites of Buddhist art, boast 45,000 square meters of murals in 735 cliff caves and more than 3,000 sculptures. Researchers have so far found more than 50,000 sutras, documents and paintings in the "cave for preserving Buddhist scriptures".