A 55-year-old volunteer makes regular patrol along a section of the Great Wall built in the Qin Dynasty (221 BC-206 BC) in north China's Inner Mongolia Autonomous Region, June 16, 2020. A 9.1-million-yuan (over $1.28 mln ) project was launched in June to restore the dilapidated parts of the 2,000-year-old Xiaoshetai section of the Great Wall in Bayannur Ciry, Inner Mongolia. The 240-kilometer-long Xiaoshetai Great Wall, which was built under the reign of the first emperor of Qin as a defense against northern tribes, is an important part of the existing Great Wall of the Qin Dynasty. (Photo: China News Service/Liu Wenhua)

Workers repair a section of the Great Wall built in the Qin Dynasty (221 BC-206 BC) in north China's Inner Mongolia Autonomous Region, June 16, 2020. A 9.1-million-yuan (over $1.28 mln ) project was launched in June to restore the dilapidated parts of the 2,000-year-old Xiaoshetai section of the Great Wall in Bayannur Ciry, Inner Mongolia. The 240-kilometer-long Xiaoshetai Great Wall, which was built under the reign of the first emperor of Qin as a defense against northern tribes, is an important part of the existing Great Wall of the Qin Dynasty. (Photo: China News Service/Liu Wenhua)

The photo taken on June 16, 2020 shows a section of the Great Wall built in the Qin Dynasty (221 BC-206 BC) in north China's Inner Mongolia Autonomous Region. A 9.1-million-yuan (over $1.28 mln ) project was launched in June to restore the dilapidated parts of the 2,000-year-old Xiaoshetai section of the Great Wall in Bayannur Ciry, Inner Mongolia. The 240-kilometer-long Xiaoshetai Great Wall, which was built under the reign of the first emperor of Qin as a defense against northern tribes, is an important part of the existing Great Wall of the Qin Dynasty. (Photo: China News Service/Liu Wenhua)

Workers repair a section of the Great Wall built in the Qin Dynasty (221 BC-206 BC) in north China's Inner Mongolia Autonomous Region, June 16, 2020. A 9.1-million-yuan (over $1.28 mln ) project was launched in June to restore the dilapidated parts of the 2,000-year-old Xiaoshetai section of the Great Wall in Bayannur Ciry, Inner Mongolia. The 240-kilometer-long Xiaoshetai Great Wall, which was built under the reign of the first emperor of Qin as a defense against northern tribes, is an important part of the existing Great Wall of the Qin Dynasty. (Photo: China News Service/Liu Wenhua)

A 55-year-old volunteer makes regular patrol along a section of the Great Wall built in the Qin Dynasty (221 BC-206 BC) in north China's Inner Mongolia Autonomous Region, June 16, 2020. A 9.1-million-yuan (over $1.28 mln ) project was launched in June to restore the dilapidated parts of the 2,000-year-old Xiaoshetai section of the Great Wall in Bayannur Ciry, Inner Mongolia. The 240-kilometer-long Xiaoshetai Great Wall, which was built under the reign of the first emperor of Qin as a defense against northern tribes, is an important part of the existing Great Wall of the Qin Dynasty. (Photo: China News Service/Liu Wenhua)