Tourists visit the scenic spot of the Mingsha Mountain and Crescent Spring in Dunhuang City, Northwest China's Gansu Province, May 21, 2013. Dunhuang has received about 749,200 tourists in the first four months of 2013, increasing 58.63 percent year on year. (Xinhua/Nie Jianjiang)

  Tourists ride on camels visiting the scenic spot of the Mingsha Mountain and Crescent Spring in Dunhuang City, Northwest China's Gansu Province, May 21, 2013. Dunhuang has received about 749,200 tourists in the first four months of 2013, increasing 58.63 percent year on year. (Xinhua/Nie Jianjiang) 

Tourists visit the scenic spot of the Mingsha Mountain and Crescent Spring in Dunhuang City, Northwest China's Gansu Province, May 21, 2013. Dunhuang has received about 749,200 tourists in the first four months of 2013, increasing 58.63 percent year on year. (Xinhua/Nie Jianjiang) 

Tourists visit the scenic spot of the Mingsha Mountain and Crescent Spring in Dunhuang City, Northwest China's Gansu Province, May 21, 2013. Dunhuang has received about 749,200 tourists in the first four months of 2013, increasing 58.63 percent year on year. (Xinhua/Nie Jianjiang)