Aerial photo taken on Aug. 10, 2020 shows the Jinshanling Great Wall shrouded in morning mist in Luanping County of Chengde City, north China's Hebei Province. (Photo by Zhou Wanping/Xinhua)

Aerial photo taken on Aug. 10, 2020 shows the Jinshanling Great Wall shrouded in morning mist in Luanping County of Chengde City, north China's Hebei Province. (Photo by Zhou Wanping/Xinhua)

Aerial photo taken on Aug. 10, 2020 shows the Jinshanling Great Wall shrouded in morning mist in Luanping County of Chengde City, north China's Hebei Province. (Photo by Zhou Wanping/Xinhua)

Aerial photo taken on Aug. 10, 2020 shows the Jinshanling Great Wall shrouded in morning mist in Luanping County of Chengde City, north China's Hebei Province. (Photo by Zhou Wanping/Xinhua)

Aerial photo taken on Aug. 10, 2020 shows the Jinshanling Great Wall shrouded in morning mist in Luanping County of Chengde City, north China's Hebei Province. (Photo by Zhou Wanping/Xinhua)

Aerial photo taken on Aug. 10, 2020 shows the Jinshanling Great Wall shrouded in morning mist in Luanping County of Chengde City, north China's Hebei Province. (Photo by Zhou Wanping/Xinhua)

Aerial photo taken on Aug. 10, 2020 shows the Jinshanling Great Wall shrouded in morning mist in Luanping County of Chengde City, north China's Hebei Province. (Photo by Zhou Wanping/Xinhua)