THE GREAT WALL OF CHINA

The great wall of China is a place of defense for the borders of the northern and northwestern parts of China. The wall runs along the east to the area surrounding Goadai, Gansu Province. On the west there is an inner wall running from the surrounding area of Beijing almost to Hadan.
The largest portion of the wall was erected by Shih Huang Ti. He was the first emperor of the Ch'in Dynasty. It was made for defense against raids by nomadic people.
Work on the wall started about 221 B.C, after Shih Huang Ti had united China. It was finished by about 204 B.C. Small sections of the wall might have already existed, but Shih Huang Ti is supposed to have had about 1900 km (about 1200 mi) of the wall erected during his rein. In later centuries, especially during the period of the Ming Dynasty (A.D 1368-1644), the Great Wall was repaired and extended. The fortification finally reached a length of about 2400 km (1500 mi). It follows the courses of rivers instead of bridging them. It conforms to the contours of the mountains and valleys in its way.
The wall is built of earth and stone. There is brick on the east side of the wall. It is from 4.6 to 9.1 m thick at the base and tapers to about 7.6 m.
There is no wonder why I chose The Great Wall Of China as my own wonder. Did you know that you can even see "The Wall" from outer space?