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Great Wall of China
The gigantic and almost unbelievable human construction is the Great Wall of China. It was built, rebuilt, and maintained between the 5th century BC and the 16th century to protect the northern borders of the Chinese Empire from the attacks of the Xiongnu tribes. One of the most famous is the wall built between 220–206 BC by the first Emperor of China but little of that wall exists.
The majority of the existing wall were built during the Ming Dynasty (1368-1644 AD). The most reliable archaeological survey has recently concluded that the entire Great Wall, with all of its branches is 8,851.8 kilometers (5,500.3 miles).
