The great wall of China is recognized as one of the unique wonders of the world. In the history of world architecture on the grandeur of this building has no equal. Constructed the Great wall of China as a military fortification, build it began in the 3rd century BC, So its history goes back more than 2000 years. A single consolidation from disparate fortresses formed the Emperor Qin Shi Huang.

Even at the time of the Warring States began construction of the great wall. The state in those days was in need of protection from enemies, in particular, against the incursions of the Huns. More than a million people were involved, at the time, it was a fifth of the population of the country.

There is a perception that the Great wall of China from space can be seen. It is wrong. There is another common myth that the solution to bond the stones was mixed from a powder of human bones, and to increase the structural strength of the dead at a construction site buried directly in the wall. But no bones of the dead and not in the wall structure, it is not true, and in the composition of the solution - the usual rice flour.

The dimensions of the wall are different in different areas, the average wall height is 7. 5 m height with a teeth - 9 m, width of the crest - 5, 5 m, base width - 6, 5 m.

Time has not spared this magnificent building, but today the Great wall of China - champion on many parameters and, above all, by the length. As before, it is the longest ever produced by man-made structures. Nowadays, the length of the wall up to 2000 km in a straight line and all its branches, and bends at an average of 5 thousand kilometers Like a huge writhing snake of the Great wall of China on the tops of mountain ranges and passes. Begins wall in Sayangan in the East and ends in the province Gansu in the West.