WHAT IS THE ONLY MAN-MADE STRUCTURE VISIBLE FROM SPACE?


Spanning 21,196 km in length, the Great Wall of China is the only man-made structure visible from space.The Great Wall of China is the collective name of a series of fortification systems generally built across the historical northern borders of China to protect and consolidate territories of Chinese states and empires against various nomadic groups of the steppe and their polities.

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