People line up to paint the exterior walls of the Potala Palace in Lhasa, Southwest China's Tibet autonomous region, Oct 28, 2020. The more than 1,300-year-old Potala Palace has been undergoing its annual facelift since Wednesday. The annual whitewashing is a tradtion to protect the building. [Photo/China News Service]

Workers paint the exterior walls of the Potala Palace in Lhasa, Southwest China's Tibet autonomous region, Oct 28, 2020. The more than 1,300-year-old Potala Palace has been undergoing its annual facelift since Wednesday. [Photo/China News Service]

A worker paints the exterior walls of the Potala Palace in Lhasa, Southwest China's Tibet autonomous region, Oct 28, 2020. [Photo/China News Service]

A worker paints the exterior walls of the Potala Palace in Lhasa, Southwest China's Tibet autonomous region, Oct 28, 2020. [Photo/China News Service]