A view of Danxia landforms at a geological park in Zhangye City, Northwest China's Gansu Province. Reminiscent of a home to aliens, the unique geomorphology is formed from red sandstone and characterized by steep cliffs. Zhangye, an important outpost on the ancient Silk Road, is home to many scenic areas with Danxia landforms that provide a unique tourism resource for the city. (Photo: China News Service/Li Xiaodong)

A view of Danxia landforms at a geological park in Zhangye City, Northwest China's Gansu Province. Reminiscent of a home to aliens, the unique geomorphology is formed from red sandstone and characterized by steep cliffs. Zhangye, an important outpost on the ancient Silk Road, is home to many scenic areas with Danxia landforms that provide a unique tourism resource for the city. (Photo: China News Service/Li Xiaodong)

A view of Danxia landforms at a geological park in Zhangye City, Northwest China's Gansu Province. Reminiscent of a home to aliens, the unique geomorphology is formed from red sandstone and characterized by steep cliffs. Zhangye, an important outpost on the ancient Silk Road, is home to many scenic areas with Danxia landforms that provide a unique tourism resource for the city. (Photo: China News Service/Li Xiaodong)

A view of Danxia landforms at a geological park in Zhangye City, Northwest China's Gansu Province. Reminiscent of a home to aliens, the unique geomorphology is formed from red sandstone and characterized by steep cliffs. Zhangye, an important outpost on the ancient Silk Road, is home to many scenic areas with Danxia landforms that provide a unique tourism resource for the city. (Photo: China News Service/Li Xiaodong)

A view of Danxia landforms at a geological park in Zhangye City, Northwest China's Gansu Province. Reminiscent of a home to aliens, the unique geomorphology is formed from red sandstone and characterized by steep cliffs. Zhangye, an important outpost on the ancient Silk Road, is home to many scenic areas with Danxia landforms that provide a unique tourism resource for the city. (Photo: China News Service/Li Xiaodong)