Great Wall of China is recognized as one of the unique wonders of the world. In the history of world architecture of the grandeur of the building has no equal. To construct the Great Wall of China as a military and defensive object, it began to build in the 3rd century BC. e. Thus, its history goes back over 2,000 years. One of the strengthening of disparate fortresses formed Emperor Qin Shi Huang.

Even at the time of the Warring States began construction of the Great Wall of China. The state at that time was needed to protect against enemies, in particular from attacks of the Xiongnu. More than a million people were put to work, while it was the fifth of the population.

It argued that the Great Wall of China from space can be seen. It is wrong. There is another common myth that the solution is to attach the stones was mixed from a powder of human bones, and to increase the structural strength of the dead were buried at a construction site directly into the wall. But there were no dead and no bones in the construction of the wall, it's not true, but as part of the solution - the usual rice flour.

Dimensions of the wall are different in different areas, with an average height of the wall is 7, 5 meters height with teeth - 9 m, width of the ridge - 5, 5 m, base width - 6, 5 m.

Time has not spared this magnificent building, but today, the Great Wall of China - record holder in many ways and, above all, by the length. As before, it is - the longest ever man-made structures. These days, the length of the wall up to 2000 km in a straight line, and taking into account all its branches and bends - it is an average of 5 thousand kilometers. Like a huge serpent writhing Great Wall of China on the tops, ridges and passes. Starts Shayhanguan wall in the city in the east and ends in Gansu Province in the west.