The Great wall of China is the largest man made construction on our planet. It was built over 2000 years ago, by Qin shi Huangdi, the first emperor of China.
Like a gigantic dragon, the Great Wall winds up and down across deserts, grasslands, mountains and Plateaus, stretching approximately 8851.8 kilometers, from east to west. Its thickness ranged from about 4.5 to 9 meters and it was up to 7.5 meters tall.
The top of the wall was wide enough for marching troops and wagons. At regular intervals, guard stations and watch towers were established.
The Great Wall of China is not a continuous wall, but is a collection of short walls that often follow the crest of hills on the southern edge of the Mongolian plain. A first set of walls, designed to keep Mongol nomads out of China, were built of earth and stones in wood frames during the Qin Dynasty. Some additions and modifications were made to these simple walls over the millennium, but the major construction of the ‘modern’ walls began in the Ming Dynasty.
Since the Great Wall was discontinuous, Mongol invaders had no trouble breaching the wall by going around it, so the wall eventually abandoned. Restoration and rebuilding took place in the 1987 the Great Wall of China was made a world Heritage Site.