Located on the eastern slopes of the Mingsha Mountain in the southeast of Dunhuang County in Gansu Province, the Mogao Grottoes are one of three best noted grottoes in China and also contain the largest, best preserved and richest treasure house of Buddhist art in the whole world. Today, 492 caves have stood the test of time and contain some 2,100 colored statues and 45,000 square meters of murals. The first Dunhuang International Cultural Expo will be held in the city from September 20 to 21. [Photo/Xinhua]