Foto de stock - The Great Wall of China is a series of sandstone and earthen fortifications in China,built,rebuilt,and maintained between the 5th century BC and the 16th century to protect the northern borders of the Chinese Empire . It is the longest human made structure stretching approximately 4000 miles. It is a UNESCO World Heritage Site.

Imagen: The Great Wall of China is a series of sandstone and earthen fortifications in China, built, rebuilt, and maintained between the 5th century BC and the 16th.

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