Aerial view of Jinshanling section of Great Wall in Hebei

This photo taken on Sept. 1, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Yang Shiyao)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Chen Bin)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Yang Shiyao)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Yang Shiyao)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Ren Zhenglai)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Chen Bin)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Yang Shiyao)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Chen Bin)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Chen Bin)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Yang Shiyao)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Yang Shiyao)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Mu Yu)

This photo taken on Sept. 1, 2023 shows tourists visiting the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Yang Shiyao)

This aerial photo taken on Aug. 31, 2023 shows a rainbow over the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Ren Zhenglai)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Chen Bin)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Chen Bin)

This aerial photo taken on Sept. 1, 2023 shows a view of the Hualougou Village at the foot of Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Chen Bin)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Mu Yu)

This photo taken on Aug. 31, 2023 shows tourists visiting the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Chen Bin)

This aerial photo taken on Aug. 31, 2023 shows a rainbow over the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Chen Bin)

This photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Chen Bin)

This aerial photo taken on Sept. 1, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Yang Shiyao)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Ren Zhenglai)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Yang Shiyao)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Yang Shiyao)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Chen Bin)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Ren Zhenglai)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Yang Shiyao)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Yang Shiyao)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Chen Bin)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Ren Zhenglai)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Chen Bin)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Chen Bin)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on Sept. 1, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on Aug. 31, 2023 shows a view of the Jinshanling section of the Great Wall in Luanping County, north China's Hebei Province. (Xinhua/Mu Yu)