4. The Great Wall of China
Great Wall of China, located on the northern border of China. Starting up Qin Dynasty (322-337 or around year 221-206 BC), with the aim. To link fortress into one to prevent the invasion of the Mongol tribes in the past. The total length of over 6,700 km is the longest man-made structure in the world has ever had. Thousands of people have dedicated their lives to building this massive addition has said that the Great Wall of China is the only building in the world, visible from outer space. Great Wall of China has been selected by the UNESCO as World Heritage Site since 2529.
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