Aerial photo taken on April 10, 2019 shows a view of Danxia landform at Danxia National Geological Park in Zhangye, northwest China's Gansu Province. Danxia landform is an unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Photos: Xinhua)

Photo taken on April 10, 2019 shows a view of Danxia landform at Danxia National Geological Park in Zhangye, northwest China's Gansu Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs.

Aerial photo taken on April 10, 2019 shows a view of Danxia landform at Danxia National Geological Park in Zhangye, northwest China's Gansu Province. Danxia landform is an unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs.

Aerial photo taken on April 10, 2019 shows a view of Danxia landform at Danxia National Geological Park in Zhangye, northwest China's Gansu Province. Danxia landform is an unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs.

Aerial photo taken on April 10, 2019 shows a view of Danxia landform at Danxia National Geological Park in Zhangye, northwest China's Gansu Province. Danxia landform is an unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs.

Aerial photo taken on April 10, 2019 shows a view of Danxia landform at Danxia National Geological Park in Zhangye, northwest China's Gansu Province. Danxia landform is an unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs.

Aerial photo taken on April 10, 2019 shows a view of Danxia landform at Danxia National Geological Park in Zhangye, northwest China's Gansu Province. Danxia landform is an unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs.

Aerial photo taken on April 10, 2019 shows a view of Danxia landform at Danxia National Geological Park in Zhangye, northwest China's Gansu Province. Danxia landform is an unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs.