This aerial photo taken on July 23, 2023 shows the scenery of the Baiyangyu section of the Great Wall in Qian'an City of north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on July 23, 2023 shows the scenery of the Baiyangyu section of the Great Wall in Qian'an City of north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on July 23, 2023 shows the scenery of the Baiyangyu section of the Great Wall in Qian'an City of north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on July 23, 2023 shows the scenery of the Baiyangyu section of the Great Wall in Qian'an City of north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on July 23, 2023 shows the scenery of the Baiyangyu section of the Great Wall in Qian'an City of north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on July 23, 2023 shows the scenery of the Baiyangyu section of the Great Wall in Qian'an City of north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on July 23, 2023 shows the scenery of the Baiyangyu section of the Great Wall in Qian'an City of north China's Hebei Province. (Xinhua/Mu Yu)

This aerial photo taken on July 23, 2023 shows the scenery of the Baiyangyu section of the Great Wall in Qian'an City of north China's Hebei Province. (Xinhua/Mu Yu).