![Aerial photo taken on Oct. 21, 2018 shows a view of Danxia landform at Wangjiawan of Pingqiao Town in Ansai District of Yan\'an, northwest China\'s Shaanxi Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Xinhua/Tao Ming)](http://www.ecns.cn/hd/2018/10/23/15f9fda83f6e4acbb6fd4025dbedec84.jpg)
Aerial photo taken on Oct. 21, 2018 shows a view of Danxia landform at Wangjiawan of Pingqiao Town in Ansai District of Yan'an, northwest China's Shaanxi Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Xinhua/Tao Ming)
![Aerial photo taken on Oct. 21, 2018 shows a view of Danxia landform at dusk at Wangjiawan of Pingqiao Town in Ansai District of Yan\'an, northwest China\'s Shaanxi Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Xinhua/Tao Ming)](http://www.ecns.cn/hd/2018/10/23/edb9cf585e494d4883786f5fec6866b1.jpg)
Aerial photo taken on Oct. 21, 2018 shows a view of Danxia landform at dusk at Wangjiawan of Pingqiao Town in Ansai District of Yan'an, northwest China's Shaanxi Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Xinhua/Tao Ming)
![Aerial photo taken on Oct. 21, 2018 shows a view of Danxia landform at Wangjiawan of Pingqiao Town in Ansai District of Yan\'an, northwest China\'s Shaanxi Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Xinhua/Tao Ming)](http://www.ecns.cn/hd/2018/10/23/48e3b7276ece40329d63265da345877d.jpg)
Aerial photo taken on Oct. 21, 2018 shows a view of Danxia landform at Wangjiawan of Pingqiao Town in Ansai District of Yan'an, northwest China's Shaanxi Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Xinhua/Tao Ming)
![Aerial photo taken on Oct. 21, 2018 shows a view of Danxia landform at Wangjiawan of Pingqiao Town in Ansai District of Yan\'an, northwest China\'s Shaanxi Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Xinhua/Tao Ming)](http://www.ecns.cn/hd/2018/10/23/5e2ceb364ce54791833866f26b10492d.jpg)
Aerial photo taken on Oct. 21, 2018 shows a view of Danxia landform at Wangjiawan of Pingqiao Town in Ansai District of Yan'an, northwest China's Shaanxi Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Xinhua/Tao Ming)
![Aerial photo taken on Oct. 21, 2018 shows a view of Danxia landform at Wangjiawan of Pingqiao Town in Ansai District of Yan\'an, northwest China\'s Shaanxi Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Xinhua/Tao Ming)](http://www.ecns.cn/hd/2018/10/23/4238d8bc0263425a8454b37a94f46310.jpg)
Aerial photo taken on Oct. 21, 2018 shows a view of Danxia landform at Wangjiawan of Pingqiao Town in Ansai District of Yan'an, northwest China's Shaanxi Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Xinhua/Tao Ming)
![Photo taken on Oct. 21, 2018 shows a view of Danxia landform at Wangjiawan of Pingqiao Town in Ansai District of Yan\'an, northwest China\'s Shaanxi Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Xinhua/Tao Ming)](http://www.ecns.cn/hd/2018/10/23/0e25699d8dab43f0808b73eec58ddfae.jpg)
Photo taken on Oct. 21, 2018 shows a view of Danxia landform at Wangjiawan of Pingqiao Town in Ansai District of Yan'an, northwest China's Shaanxi Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Xinhua/Tao Ming)
![Photo taken on Oct. 21, 2018 shows a view of Danxia landform at Wangjiawan of Pingqiao Town in Ansai District of Yan\'an, northwest China\'s Shaanxi Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Xinhua/Tao Ming)](http://www.ecns.cn/hd/2018/10/23/7b07839a11864456ac4e5085f7ade55f.jpg)
Photo taken on Oct. 21, 2018 shows a view of Danxia landform at Wangjiawan of Pingqiao Town in Ansai District of Yan'an, northwest China's Shaanxi Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Xinhua/Tao Ming)
![Aerial photo taken on Oct. 21, 2018 shows a view of Danxia landform at Wangjiawan of Pingqiao Town in Ansai District of Yan\'an, northwest China\'s Shaanxi Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Xinhua/Tao Ming)](http://www.ecns.cn/hd/2018/10/23/01f6c994116944c1af243f5f2f09345a.jpg)
Aerial photo taken on Oct. 21, 2018 shows a view of Danxia landform at Wangjiawan of Pingqiao Town in Ansai District of Yan'an, northwest China's Shaanxi Province. Danxia landform is a unique type of geomorphology formed from red-colored sandstones and characterized by steep cliffs. (Xinhua/Tao Ming)