Oct. 25, 2018 -- Workers paint the Red Palace, part of the Potala Palace, during annual renovation work following the end of the rainy season in Lhasa, Southwest China`s Tibet autonomous region, Oct 23, 2018. The painting work will take one week. [Photo/China News Service]

Oct. 25, 2018 -- A retiree from the Potala Palace administration office helps workers during annual renovation work following the end of the rainy season in Lhasa, Southwest China`s Tibet autonomous region, Oct 23, 2018. [Photo/China News Service]

Oct. 25, 2018 -- Workers paint the Red Palace, part of the Potala Palace, during annual renovation work following the end of the rainy season in Lhasa, Southwest China`s Tibet autonomous region, Oct 23, 2018. [Photo/China News Service]

Oct. 25, 2018 -- A worker paints the Red Palace, part of the Potala Palace, during annual renovation work following the end of the rainy season in Lhasa, Southwest China`s Tibet autonomous region, Oct 23, 2018. [Photo/China News Service]

Oct. 25, 2018 -- A tourist from the United States greets pilgrims to the Potala Palace in Lhasa, Southwest China`s Tibet autonomous region, Oct 23, 2018. [Photo/China News Service]