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

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

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.

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.

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.

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.

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.

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.

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

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.