That's how they came to Burns' attention. One of Burns' specialties is in geological landforms, or geomorphology. "This was a landform that he had never seen before," Burns said. "He got in touch ...

Tourists flock to the Zhangye Danxia National Geological Park in Gansu province to witness the beauty of the Danxia landform. [Photo by Shi Xuefan/chinadaily.com.cn] As summer vacation arrives ...