Tourists wearing miners’ overalls visit the pit at Shanxi Jinhuagong National Mine Park in Datong on May 16. The "adventure down the mine" allows visitors to discover the whole process of underground coal mining along with the development of mining technology. [Photo/Xinhua]

A tourist explores the pit at Shanxi Jinhuagong National Mine Park in Datong on May 16. The park covers an area of 360,000 square kilometers and consists of seven areas, including Datong Coal Museum. [Photo/Xinhua]

Students stand in front of Datong Coal Museum at Shanxi Jinhuagong National Mine Park on May 16, posing for a photo. [Photo/Xinhua]