The Great Wall section has been under restoration. These pictures show the site of an arch door on the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province.

Photo taken on Dec. 5, 2017 shows the site of an arch door on the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

Photo taken on Dec. 5, 2017 shows the site of an arch door on the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

The arch door on the Great Wall was reduced to ruins after a strong gale in October last year. Now the reinforcements and repair work have been completed on the arch door site. The archway had been the remains of a former watchtower on the Guangwu Great Wall. It was called the "Moon Gate" by Great Wall aficionados due to its round shape. 

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Photo taken on Dec. 5, 2017 shows the site of an arch door on the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

The Great Wall section has been under restoration. These pictures show the site of an arch door on the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province.

Photo taken on Dec. 5, 2017 shows the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

The arch door on the Great Wall was reduced to ruins after a strong gale in October last year. Now the reinforcements and repair work have been completed on the arch door site. The archway had been the remains of a former watchtower on the Guangwu Great Wall. It was called the "Moon Gate" by Great Wall aficionados due to its round shape.

Photo taken on Dec. 4, 2017 shows a watchtower site on the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

Photo taken on Dec. 4, 2017 shows a watchtower site on the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

Photo taken on Dec. 5, 2017 shows the site of an arch door on the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

Photo taken on Dec. 5, 2017 shows the site of an arch door on the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

Photo taken on Dec. 5, 2017 shows the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

Photo taken on Dec. 5, 2017 shows the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

Photo taken on Dec. 5, 2017 shows the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

Photo taken on Dec. 5, 2017 shows the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

Photo taken on Dec. 4, 2017 shows a watchtower site on the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

Photo taken on Dec. 4, 2017 shows a watchtower site on the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

Photo taken on Dec. 5, 2017 shows the site of an arch door on the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

Photo taken on Dec. 5, 2017 shows the site of an arch door on the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

Photo taken on Dec. 5, 2017 shows the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)

Photo taken on Dec. 5, 2017 shows the Guangwu Great Wall section built during the Ming Dynasty (1368-1644) in Shanyin County, north China's Shanxi Province. (Xinhua/Zhan Yan)