![]() ![]() One surviving section of such an ancient wall, in the Shandong province, is made of hard-packed soil called “ rammed earth” and is estimated to be 2,500 years old. ![]() ![]() However, this does not detract from the wonder of this astounding ancient structure.įor millennia, Chinese leaders instituted wall-building projects to protect the land from northern, nomadic invaders. Since the wall looks a lot like the stone and soil that surround it, it is difficult to discern with the human eye even from low Earth orbit, and is difficult to make out in most orbital photos. The one thing most people “know” about the Great Wall of China-that it is one of the only man-made structures visible from space-is not actually true.
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