A site in northwestern China with many Buddhist sculptures, frescoes, and Mogao grottoes. It was a Chinese frontier outpost at a place where the Silk Route branched before crossing Central Asia. It was established as a Han military commandery in 111 BC and many documents and manuscripts dating from the Han dynasty have been found there. There is a complex of nearly 500 Buddhist cave temples with well-preserved paintings and sculptures. A Buddhist library walled up in a cave around 1035 and rediscovered in 1900 contained thousands of manuscripts written in Chinese and various Central Asian scripts, some with dates ranging from 406-996. Among the material in the British Museum is the oldest extant printed book in the world, a Chinese translation of the Diamond Sutra, a Buddhist text, dated 868 AD. Many other manuscripts and paintings obtained by Aurel Stein are kept at the British Museum.