Interior of Wanfotang grottoes scenic spot is seen in Yixian County, Jinzhou City of northeast China's Liaoning Province, June 12, 2020. The grottoes have a history of more than 1,500 years. (Xinhua/Yao Jianfeng)

Interior of Wanfotang grottoes scenic spot is seen in Yixian County, Jinzhou City of northeast China's Liaoning Province, June 12, 2020. The grottoes have a history of more than 1,500 years. (Xinhua/Yao Jianfeng)

People visit the Wanfotang grottoes scenic spot in Yixian County, Jinzhou City of northeast China's Liaoning Province, June 12, 2020. The grottoes have a history of more than 1,500 years. (Xinhua/Yao Jianfeng)

Interior of Wanfotang grottoes scenic spot is seen in Yixian County, Jinzhou City of northeast China's Liaoning Province, June 12, 2020. The grottoes have a history of more than 1,500 years. (Xinhua/Yao Jianfeng)

Exterior of Wanfotang grottoes scenic spot is seen in Yixian County, Jinzhou City of northeast China's Liaoning Province, June 12, 2020. The grottoes have a history of more than 1,500 years. (Xinhua/Yao Jianfeng)

People visit the Wanfotang grottoes scenic spot in Yixian County, Jinzhou City of northeast China's Liaoning Province, June 12, 2020. The grottoes have a history of more than 1,500 years. (Xinhua/Yao Jianfeng)