The Great Wall of China, is the military architecture, it is sweeping, engineering, known as the history of ancient humans a miracle.
The Great Wall dates in the fifth century B.C., the spring-autumn and warring age in the 3rd century BC, qin shihuang unified China MengTian xiongnu army led by 300,000 north section after the original building, the Great Wall, and connect to build. By extension, to continuously maintenance in the seventeenth century A.D. in * * * * generation, and not in the construction of more than 2,000 years.