Autumn scenery of Mutianyu section of Great Wall in Beijing

Tourists visit the Mutianyu section of the Great Wall in Beijing, capital of China, Oct. 21, 2023. (Xinhua/Chen Yehua)

This photo taken on Oct. 21, 2023 shows the autumn scenery of the Mutianyu section of the Great Wall in Beijing, capital of China. (Xinhua/Chen Yehua)

Tourists visit the Mutianyu section of the Great Wall in Beijing, capital of China, Oct. 21, 2023. (Xinhua/Chen Yehua)

This aerial photo taken on Oct. 21, 2023 shows the autumn scenery of the Mutianyu section of the Great Wall in Beijing, capital of China. (Xinhua/Chen Yehua)

This aerial photo taken on Oct. 21, 2023 shows the autumn scenery of the Mutianyu section of the Great Wall in Beijing, capital of China. (Xinhua/Chen Yehua)

This aerial photo taken on Oct. 21, 2023 shows the autumn scenery of the Mutianyu section of the Great Wall in Beijing, capital of China. (Xinhua/Chen Yehua)

This aerial photo taken on Oct. 21, 2023 shows the autumn scenery of the Mutianyu section of the Great Wall in Beijing, capital of China. (Xinhua/Chen Yehua)

This photo taken on Oct. 21, 2023 shows the autumn scenery of the Mutianyu section of the Great Wall in Beijing, capital of China. (Xinhua/Chen Yehua)

This photo taken on Oct. 21, 2023 shows the autumn scenery of the Mutianyu section of the Great Wall in Beijing, capital of China. (Xinhua/Chen Yehua)

Tourists visit the Mutianyu section of the Great Wall in Beijing, capital of China, Oct. 21, 2023. (Xinhua/Chen Yehua)

This aerial photo taken on Oct. 21, 2023 shows the autumn scenery of the Mutianyu section of the Great Wall in Beijing, capital of China. (Xinhua/Chen Yehua)

This aerial photo taken on Oct. 21, 2023 shows the autumn scenery of the Mutianyu section of the Great Wall in Beijing, capital of China. (Xinhua/Chen Yehua)

Tourists visit the Mutianyu section of the Great Wall in Beijing, capital of China, Oct. 21, 2023. (Xinhua/Chen Yehua)

This aerial photo taken on Oct. 21, 2023 shows the autumn scenery of the Mutianyu section of the Great Wall in Beijing, capital of China. (Xinhua/Chen Yehua)

This aerial photo taken on Oct. 21, 2023 shows the autumn scenery of the Mutianyu section of the Great Wall in Beijing, capital of China. (Xinhua/Chen Yehua)