Wall of China Great Wall, one of the seven wonders built by man, is the largest and most distinctive of these wonders and achievements. It is considered the longest building ever in history and history. It is believed to have been built from the fourth century BC until the 17th century AD, an important site of the World Heritage.
The construction of the wall of China built the Great Wall of China stone and clay, the eastern side covered with brick completely, and the width of this fence in some places four meters and six centimeters, and in other places, for example, we find nine meters and one centimeter, Three meters and seven centimeters, and the height of it is up to three meters in most places, and eight meters in other places, has been placed in this fence towers guarding the length of twelve meters, and each tower away from the other about 100 meters. During the construction works, about 10,000 workers who were buried near the fence were killed. The purpose of the construction of the fence was to serve as a military purpose. The northern empire's borders must be protected from attacks by the aggressors. The wall has been repaired for many times, and has been restored and rebuilt over the ages. The wall remains preserved to this day, but its eastern side extends several kilometers, with some minor effects in different places
The length of the wall of China The determination of the length of this fence accurately stop the researchers and historians, according to an official account that it is six thousand seven hundred kilometers, but the Chinese Agency for the preservation of heritage confirmed that the true length of eight thousand and eight hundred and fifty kilometers, In the year two thousand and eight AD, to return this agency correct information in the year 2000 and the birth of twelve, where it said that the real length of twenty-one thousand and one hundred and ninety-nine kilometers. Despite the efforts of the rulers of China to build this fence, it failed to repel the attacks on the country, especially barbarians. History books state that the first Mongol leader was able to break into this wall, accompanied by large numbers of his army, the commander Genghis Khan , And that was in the year one thousand and two hundred and thirteen.
