Staff members of the Potala Palace work on registration of ancient documents in Lhasa, capital of southwest China's Tibet Autonomous Region, Nov. 16, 2018. The Chinese government will invest 300 million yuan (44.9 million U.S. dollars) in the next 10 years in its greatest efforts of protection and utilization of ancient documents in the Potala Palace, a World Heritage site in Lhasa, southwest China's Tibet Autonomous Region, according to the management office of the Potala Palace. (Xinhua/Purbu Zhaxi)