Giant construction of the ancient world, the Great Wall measuring 6400 kilometers long, is provided from place to place with forts looking tall rectangular towers of defense, has a height of 8 meters and a width of 6.5 meters, and meritandu status of the longest wall of the Earth. To protect the state, China's first emperor, Qin (221-210 BC) commands to be linked together fortifications built by his predecessors. It will submit both east and west, a total length of about 5000 km, making the longest wall that will become subsequently famous. During the next dynasty, the Han (206-220 BC), the wall was again extended to the east and west to a length of 10 000 km length. Suffering major damage over a millennium, the Great Wall was rebuilt about 6400 km in the Ming dynasty (1368-1644) dynasty, which has set and the capital of Beijing (the form in which it kept until today). One of the most popular touristic places is the section located about 70 kilometres away from Beijing.