4. Wall of China
Great Wall of China, located on the northern border of China. Starting built during the Qin Dynasty (322-337 or about the year 221-206 BC), with the aim of linking the fort as one to prevent the invasion of the Mongol tribes in the past. The total length of more than 6,700 kilometers is the longest man-made structure in the world has ever seen. Several thousand people have devoted their lives to building a massive addition, has said that the Great Wall of China is the only building in the world can be seen from space. Great Wall of China has been selected by the UNESCO as a World Heritage Site in 2529.
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