Aerial photo taken on Sept. 18, 2020 shows the scenery of Lishan Mountain in Xi'an, northwest China's Shaanxi Province. (Xinhua/Shao Rui)

Tourists take photos with the sunset scenery of Lishan Mountain in Xi'an, northwest China's Shaanxi Province, July 19, 2020. (Xinhua/Shao Rui)

Aerial photo taken on Oct. 19, 2020 shows vehicles driving on the mountain road on Lishan Mountain at sunset in Xi'an, northwest China's Shaanxi Province. (Xinhua/Shao Rui)

Aerial photo taken from Lishan Mountain on July 19, 2020 shows the night view of Lintong District in Xi'an, northwest China's Shaanxi Province. (Xinhua/Shao Rui)

Photo taken on Sept. 18, 2020 shows the scenery of the mountain road on Lishan Mountain at sunset in Xi'an, northwest China's Shaanxi Province. (Xinhua/Shao Rui)

Photo taken on Aug. 13, 2020 shows the scenery of the mountain road on Lishan Mountain at sunset in Xi'an, northwest China's Shaanxi Province. (Xinhua/Shao Rui)

Aerial photo taken on July 19, 2020 shows the night view of the mountain road on Lishan Mountain in Xi'an, northwest China's Shaanxi Province. (Xinhua/Shao Rui)

Aerial photo taken on July 19, 2020 shows vehicles driving on the mountain road on Lishan Mountain in Xi'an, northwest China's Shaanxi Province. (Xinhua/Shao Rui)

Photo taken on Aug. 25, 2020 shows the sunset scenery of Lishan Mountain in Xi'an, northwest China's Shaanxi Province. (Xinhua/Shao Rui)

File photo taken on Sept. 21, 2019 shows people posing for a photo with the sunset scenery on Lishan Mountain in Xi'an, northwest China's Shaanxi Province. (Xinhua/Shao Rui)