
A tourist visits the underground tunnel of an abandoned colliery to learn the coal mining experiences at the Jinhuagong National Mine Park in Datong City, north China's Shanxi Province, May 16, 2017. (Xinhua/Cao Yang)
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A tourist visits the underground tunnel of an abandoned colliery to learn the coal mining experiences at the Jinhuagong National Mine Park in Datong City, north China's Shanxi Province, May 16, 2017. (Xinhua/Cao Yang)