1907, British archaeologist marc aurel stein traveled to Dunhuang along the ancient Silk Road south of Lop Nur on his second archaeological trip to Central Asia. When he heard that the cave of Tibetan scriptures had been found in the Mogao Grottoes, he found the king and expressed his willingness to help build the Taoist temple, which won the trust of the king. So Stan was allowed to enter the Tibetan Sutra Cave to select documents. He finally took away 24 boxes of notebooks and 5 boxes of other artworks with only 200 taels of silver. 19 14, stein came to the Mogao grottoes again and bought 570 Dunhuang documents from the king for 500 taels of silver. Most of these collections were donated to the British Museum and some museums in India. The British Museum now has about13,700 Dunhuang-related collections, making it the largest museum in the world with Dunhuang cultural relics. However, it has been criticized for its poor protection of China's cultural relics and even its theft.