Aerial photo taken on July 30, 2019 shows tourists going sightseeing on a transparent cantilever bridge at the Yunyang Longgang Geological Park in Chongqing, southwest China. (Xinhua/Wang Quanchao)

Aerial photo taken on July 30, 2019 shows tourists going sightseeing on a transparent cantilever bridge at the Yunyang Longgang Geological Park in Chongqing, southwest China. (Xinhua/Wang Quanchao)

Tourists go ashore at the Yunyang Longgang Geological Park in Chongqing, southwest China, July 30, 2019. (Xinhua/Wang Quanchao)

Aerial photo taken on July 30, 2019 shows tourists going sightseeing on a transparent cantilever bridge at the Yunyang Longgang Geological Park in Chongqing, southwest China. (Xinhua/Wang Quanchao)

Tourists go sightseeing at the Yunyang Longgang Geological Park in Chongqing, southwest China, July 30, 2019. (Xinhua/Wang Quanchao)

Photo taken on July 30, 2019 shows a lizard at the Yunyang Longgang Geological Park in Chongqing, southwest China, July 30, 2019. (Xinhua/Wang Quanchao)

Photo taken on July 30, 2019 shows the scenery of the Yunyang Longgang Geological Park in Chongqing, southwest China. (Xinhua/Wang Quanchao)

Tourists go sightseeing at the Yunyang Longgang Geological Park in Chongqing, southwest China, July 30, 2019. (Xinhua/Wang Quanchao)

Aerial photo taken on July 30, 2019 shows the scenery of the Yunyang Longgang Geological Park in Chongqing, southwest China. (Xinhua/Wang Quanchao)

Tourists enjoy the scenery of the Yunyang Longgang Geological Park in Chongqing, southwest China, July 30, 2019. (Xinhua/Wang Quanchao)

Aerial photo taken on July 30, 2019 shows the scenery of the Yunyang Longgang Geological Park in Chongqing, southwest China. (Xinhua/Wang Quanchao)

Tourists take photos at the Yunyang Longgang Geological Park in Chongqing, southwest China, July 30, 2019. (Xinhua/Wang Quanchao)

Tourists pose for a group photo on a transparent walkway at the Yunyang Longgang Geological Park in Chongqing, southwest China, July 30, 2019. (Xinhua/Wang Quanchao)

Tourists enjoy the scenery of the Yunyang Longgang Geological Park in Chongqing, southwest China, July 30, 2019. (Xinhua/Wang Quanchao)

Photo taken on July 30, 2019 shows the scenery of the Yunyang Longgang Geological Park in Chongqing, southwest China. (Xinhua/Wang Quanchao)