الاثنين، 7 يناير 2013

Great Wall of China

Great Wall of Chinaflickr/betta design
The Great Wall of China built, rebuilt, and maintained between the 5th century BC and the 16th century to protect the northern borders of the Chinese Empire from the attacks of the Xiongnu tribes. Several walls have been built that were referred to as the Great Wall. One of the most famous is the wall built between 220–206 BC by the first Emperor of China but little of that wall remains. The majority of the existing wall were built during the Ming Dynasty (1368-1644 AD). The most comprehensive archaeological survey has recently concluded that the entire Great Wall, with all of its branches, stretches for 8,851.8 kilometers (5,500.3 miles).

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