The Great Wall of China.
We know Great Wall of China as a wonder of the world but now we learn more in this post.
The first emperor of China Qin shi Huang built great wall of China to protect from the Mongols. This wall extends upto 21,196 km (13,171 MI) .
The Great Wall of China was recognized as an UNESCO world heritage site at 1987.
The Great Wall of China was continuously built from 3rd century BC to 17th century AD.
Since machines we know didn't existed at that time she whole wall was built by human power.
The Great Wall of China was not fully constructed as we see today. It was existed parts of walls around kingdoms then the Ming dynasty constructed to join the parted walls to make one great wall.
This is the end point image of great wall of China
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