A child enjoys the view of Shanghai through a telescope from Shanghai Tower on Sunday afternoon.

Fifteen "left-behindchildren" from Dabie Mountain area in Anhui Province reunited with their parents in Shanghai over the weekend.

The term "left-behind children" describes children from across China who live with their grandparents while their parents work far away in large cities to support the family.

The children arrived in Shanghai on Saturday and on Sunday visited China's tallest building, Shanghai Tower, with their parents who work in the city.

As one of the organizers of the activity, Shanghai Tower staff said they wanted to thank the families for their contribution to the city. They called on more people and institutions to "devote their love to these special children and families."

A survey conducted in 2014 showed there were more than 60 million "left-behind children" in China, accounting for almost 37.7 percent of the country's rural children.

A group birthday party is held in Shanghai Tower on Sunday afternoon.

Two children take a photo with their parents while visiting Shanghai Tower on Sunday afternoon.

A child writes a postcard at Shanghai Tower on Sunday afternoon.