A tourist shows his wristband which allows him to transfer from the digital display center of Mogao Grottoes to the entity of caves in Dunhuang, northwest China's Gansu Province, Aug. 1, 2014. The Mogao Grottoes, a UNESCO world heritage with more than 2,000 colored statues and 45,000 square meters of murals, represents the great achievements of Buddhist art from the 4th to the 14th century. A digital display center of Mogao Grottoes officially opened to public on Friday, with more than 2,700 bookings through www.mgk.org.cn as the first batch of tourists. [Photo/Xinhua]