Introduction to the Ancient Great Wall: Huairou, as the northern gateway to the capital, has been the first line of defense against Xiongnu invasion since ancient times. During the Ming and Qing Dynasties, the imperial court built a large number of Great Walls here. Although the wild Great Wall on the mountain today is in disrepair due to age It is unbearable, but the accompanying valley and Tanxi scenery are beautiful and have always been considered a major landscape in Huairou County. The Ming Dynasty Great Wall in the Jiugukou area runs along the mountains, about 4.5 kilometers long, and stretches continuously with the "Mutianyu Great Wall".
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