Tianti Mountain Grotto in China's Gansu（5）

Tianti Mountain Grotto in China's Gansu

Aerial photo taken on Oct. 14, 2018 shows the Tianti Mountain Grotto in Wuwei City, northwest China's Gansu Province. With a history of 1,600 years, the Tianti Mountain Grotto is one of the earliest grottos excavated in China. (Xinhua/Fan Peishen)