The Great Wall of China.

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                     The Great Wall of China


The Great Wall of China is the largest defense fortification and the greatest building enterprise ever undertaken by man. About 1500 miles long, this unique wall stretches from the Gulf of Chihil of the Yellow see  along the northern frontier of China to Kansu province in the west. The width of this wall varies from 15to 40 feet at the base, and from 12 to 35 feet at the summit. Its height ranges from 20, to 500 feet. It is the only structure on earth that can be identified from the moon.                     Image result for The Great Wall of China

Walled frontiers between the kingdoms in China date from at least the 4th century, B. C. In the 3rd century B. C., the first emperor of “Chin”, after uniting China, linked up the existing walls and built new sections to create the Great continuous unit. His purpose was to defend China from Huns on the north. Watch the towers garrison stations were set at regular intervals in order to send signals and guard the bulwark.                                  Image result for The Great Wall of China


The wall was constructed in such a way that troops summoned by beacon fire could be quickly transported along its top. The Wall was built mostly of rubble, although the western sections are of tamped earth and important passes are of brick or masonry. The wall was frequently modified in later centuries. Some of its sections were built in the 15th and 16th centuries with new facilities of high towers. “Before that extensive repairs and extensions were made at various periods, notable during the Ming dynasty.

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