People visit the Yungang Grottoes in Datong, north China's Shanxi Province, May 9, 2021. Datong, with a history of over 2,000 years, is one of China's ancient capitals. In recent years, Datong has developed its tourism combining rich cultural heritages and well-known attractions. The historic city is shining with a new vitality. (Xinhua/Zhan Yan)

This photo taken on June 8, 2023 shows a view of Datong ancient town in Datong, north China's Shanxi Province. Datong, with a history of over 2,000 years, is one of China's ancient capitals. In recent years, Datong has developed its tourism combining rich cultural heritages and well-known attractions. The historic city is shining with a new vitality. (Xinhua/Yang Chenguang)

Technicians with the Yungang Grottoes Research Institute collect data at the Yungang Grottoes in Datong, north China's Shanxi Province, May 8, 2021. Datong, with a history of over 2,000 years, is one of China's ancient capitals. In recent years, Datong has developed its tourism combining rich cultural heritages and well-known attractions. The historic city is shining with a new vitality. (Xinhua/Zhan Yan)

People visit the Datong ancient town in Datong, north China's Shanxi Province, June 8, 2023. Datong, with a history of over 2,000 years, is one of China's ancient capitals. In recent years, Datong has developed its tourism combining rich cultural heritages and well-known attractions. The historic city is shining with a new vitality. (Xinhua/Yang Chenguang)