An aerial drone photo taken on July 21, 2025 shows a view of the Yumuling section of the Great Wall in Qianxi County, north China's Hebei Province. (Photo by Liu Mancang/Xinhua)

An aerial drone photo taken on July 21, 2025 shows a view of the Yumuling section of the Great Wall in Qianxi County, north China's Hebei Province. (Photo by Liu Mancang/Xinhua)

An aerial drone photo taken on July 21, 2025 shows a view of the Yumuling section of the Great Wall in Qianxi County, north China's Hebei Province. (Photo by Liu Mancang/Xinhua)

An aerial drone photo taken on July 21, 2025 shows a view of the Yumuling section of the Great Wall in Qianxi County, north China's Hebei Province. (Photo by Liu Mancang/Xinhua)

An aerial drone photo taken on July 21, 2025 shows a view of the Yumuling section of the Great Wall in Qianxi County, north China's Hebei Province. (Photo by Liu Mancang/Xinhua)