Battling against time in China's unmarked Muslim cemeteries

It's been several years since Yasin and his parents stood across the street of the deserted slope to talk to their deceased loved one. "I was 10 years old when my grandfather passed away in 2010. Back then, I would come here with my family to visit my grandfather's grave, but a couple of years later, we could no longer find it," Yasin told us.