The great historical wall of china.

The greatest historical wall of china. It is the largest defence fortification and the greatest building enterprise ever undertaken by man. It is world largest wall. About 1500 miles long, this unique wall stretches from the Gulf of China of the Yellow sea along the northern frontier of china to Kansu province in the west. The width of this wall varies from 15 to 40 feet at the base, and from at least the 4th century B.C. The construction of the great wall began four hundred years before Jesus Christ. In the 3rd century BC the first emperor of “ch’ in” after uniting china, linked up the existing walls and built new sections to create the Great Wall as a continuous unit. His purpose was to defend china from the Huns on the north. Watch towers and garrison stations were set at regular intervals in order to send signals and guard the bulwark. The wall was constructed in such a way that troops summoned by beacon fire could be quickly transported along its top. It is famous wall of the world. So it is very interesting and historical place. The wall is the greatest building yet made by men. It built mostly of rubble, although the western sections are of tamped earth and important passers are of brick or masonry. It is historical that one can identify the wall from the moon. The Great Wall of China seems to be picturesque. The wall was frequently modified in later centuries. Some of its sections were built in the 15th and 16th century with new facilities of high towers. Before that, extensive repairs and extensions were made at various periods, notably during the Ming dynasty. Every year many tourists come here to see this great wall. Now it is one of the greatest Tourist attractions and best architectural beauties.