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Based on historical records, they think that over 700,000 people took 38 years to complete this necropolis, mausoleum and tomb, and army for Emperor Qin and he was buried there when he died in the 200s BC.
Some of these miracles of creation have travelled to Barcelona, Madrid, and London. And, now, alas, reports indicate that they are being destroyed by pollution and soot in poorly regulated, rapidly industrializing dear China. You can read more about these works of art, these miracles of humanity at the following links:
http://en.wikipedia.org/wiki/Terracotta_Army
or
http://worldheritage.heindorffhus.dk/frame-ChinaMausoleumQin.htm