A piece of mural is seen at the Bingling Temple Grottoes in Yongjing county, northwest China's Gansu province, July 17, 2013. Listed as part of the ancient Silk Road for the World Heritage candidate, the grottoes will be reviewed by experts from UN Educational, Scientific and Cultural Organization after renovation of a giant Buddha statue dating back more than 1,000 years to the Tang Dynasty was completed lately. Bingling Temple Grottoes, filled with Buddhist statues, stupas and murals, were a work in progress between the 4th and 10th centuries.[Photo/Xinhua]