Sun Lina, a staff member of the research institute of the Yungang Grottoes, dusts a cultural relic of the grottoes at the institute in Datong, north China's Shanxi Province, April 15, 2025. Yungang Grottoes was built during the Northern Wei Dynasty (386-534). It is considered a pinnacle of Chinese Buddhist art and represents the highest level of sculptural artistry in the world during the 5th century. (Xinhua/Zhan Yan)