Tourists take selfie with a Buddha statue in one of the caves of the Yungang Grottoes, a 1,500-year-old Buddhist site in north China's Shanxi Province, Aug. 30, 2015. Listed as a UNESCO World Heritage site in 2001, the Yungang Grottoes contain more than 51,000 statues of the Buddha, with the largest measuring 17 meters high and the smallest two centimeters. (Xinhua/Wang Song)