An exhibition of Yongle Dadian, among the world's largest old encyclopedias, opens at the National Library of China in Beijing, Sept. 28, 2018. The display shows pages from the encyclopedia, which dates back to the Ming Dynasty (1368-1644), when it was compiled during the reign of Emperor Yongle. (Photo/VCG)
An exhibition of Yongle Dadian, among the world's largest old encyclopedias, opens at the National Library of China in Beijing, Sept. 28, 2018. The display shows pages from the encyclopedia, which dates back to the Ming Dynasty (1368-1644), when it was compiled during the reign of Emperor Yongle. (Photo/VCG)
An exhibition of Yongle Dadian, among the world's largest old encyclopedias, opens at the National Library of China in Beijing, Sept. 28, 2018. The display shows pages from the encyclopedia, which dates back to the Ming Dynasty (1368-1644), when it was compiled during the reign of Emperor Yongle. (Photo/VCG)
An exhibition of Yongle Dadian, among the world's largest old encyclopedias, opens at the National Library of China in Beijing, Sept. 28, 2018. The display shows pages from the encyclopedia, which dates back to the Ming Dynasty (1368-1644), when it was compiled during the reign of Emperor Yongle. (Photo/VCG)
An exhibition of Yongle Dadian, among the world's largest old encyclopedias, opens at the National Library of China in Beijing, Sept. 28, 2018. The display shows pages from the encyclopedia, which dates back to the Ming Dynasty (1368-1644), when it was compiled during the reign of Emperor Yongle. (Photo/VCG)