Extending more than 6,000 kilometers from the mountains of Korea to the Gobi Desert, the Great Wall of China is the biggest construction attributed to human hands, and the single structure built by men that is purportedly noticeable to astronauts orbiting in space.
The construction of the Wall commenced more than 9,000 years ago and was at first hundreds of miles of divided walls constructed by different rulers of China's independent states. But roughly in 220 B.C., Shi Huang Di became the first emperor of a unified China and concluded that the different walls required strengthening and connecting together. He gave directives for thousands of watchtowers to be constructed 12 meters tall and 12 square meters at their base with 6-metre walls of granite linking them.
For the workers who survived, the difficulty they confronted was the ever-altering landscape as they journeyed west. There wasn't at all times rock obtainable, hence they utilized earth and rubble that they pounded until it was firm. In additional locations the hills were so precipitous that oxen couldn't drag the carts of rock up to the construction spot, thus the men themselves moved the rocks on their backs. In the desert, the wall was constructed by means of sand, pebbles as well as grass.
The basic objective that prompted the construction of the Great Wall of China was to defend the country from external enemies though when the construction of the wall initially started, China didn't have any potent adversaries. It appears the wall may have been much more helpful at restraining the Chinese people inside their territory than at preventing the intrusion by enemies. However many are of the view that the wall was actually constructed to gratify the emperor's fear and his love of ostentatious schemes and that his officials encouraged the unwarranted structure as it was in addition a wonderful way to keep criminals engaged.
Whatever the emperor's motives for building the gigantic wall, he didn't survive long enough to enjoy the fruits of it. He passed away in 210 B.C. and due to a great deal of bickering and treachery, his dynasty, named the Qin dynasty, disintegrated only four years afterward. The Han dynasty that came next utilized the Wall efficiently to defend against enemies, but after that dynasty's fall; enemy tribes acquired power in the north, and seized it for some 400 years. It was strengthened, and in the 13th century A.D., the legendary Mongol aggressor Genghis Khan took two years to penetrate it.