The great wall of china is unique in sense
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The Great Wall of China is over 6,000 kilometers. This is the wall often referred to when we talk about the Great Wall. But according to the State Administration of Cultural Heritage and National Bureau of Surveying and Mapping Agency in 2009, the latest data of the length of the Great Wall is 8851.8 km, which is 2000km longer than the past data. On June 5th, 2012, after four years of investigation, with concerted efforts of over 4,000 technicians, it came to a conclusion that the accurate length of the Great Wall is 21,196.18 kilometers, including all the walls built in different dynasties around China.
Great Wall is the world’s longest human structure, stretching over approximately 6,400
kilometers from Shanhalgun in the east to Lopnur in the west. The Great Wall of China has
been important in China throughout history. One of the highest points of the Great Wall is 10.5 meters tall. Spaced at regular intervals are the
watchtowers that appear every 90-180 meters.