Known as the Donggar and Piyang grottoes, the 1,000-year-old caverns in the Tibet Autonomous Region's Ngari Prefecture hold one of the world's greatest collections of Tibetan Buddhist murals.

Frescoes that are currently open to the public mainly depict Buddhas, Bodhisattvas and other deities, but also feature animals that are not native to Ngari. (Xinhua/Fei Maohua)