Streams of mountain climbers and long stretches of camels with visitors on their backs, have made Mingsha Moutain in Dunhuang City, northwest China's Gansu Province, a popular tourism spot in the summer vacation. /CFP

The scenic spot welcomed an increasing number of tourists in July. According to the local tourism bureau, more than 8,000 tourists visited the spot on July 11, doubling the number at the beginning of the month. /CFP

Also known as the Echoing-Sand Mountain, the 3,000-year-old mountain is one of the dunes that makes a singing sound under certain conditions. /CFP

In the summertime, the scorching heat, blowing wind and human activity can make echoing sounds. /CFP