One of the most famous structures of the world and unique human structure that can be seen from the space.The Great Wall of China is built, rebuilt, and maintained between the 5th century BC and the 16th century to protect the northern borders of the Chinese Empire during the rule of successive dynasties. It is the world's longest human made structure, stretching over approximately 6,400 km from Shanhaiguan in the east to Lop Nur in the west, along an arc that roughly delineates the southern edge of Inner Mongolia, but stretches to over 6,700 km in total. It is also the largest human made structure ever built in terms of surface area and mass. It is located in china.
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