Stars of Perseus and the eye-catching cluster of Pleiades over the gate of Ja Yu at the west end of Great Wall of China; where once was the eastern edge of the ancient Silk Road. The Great wall of China has built and rebuilt from 5th century BC to the 16th century, to protect the northern borders of the Chinese Empire. The Great Wall, a World Heritage Site, is the world’s longest human-made structure, stretching over approximately 6,400 km from Shanhaiguan in the east to Lop Nur in the west.



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