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Cool
Facts
 |  Sentries
on the wall burned wood and straw mixed with wolf dung to produce thick
black columns of smoke. One column meant a force of less than 500 was
attacking; four columns indicated an attack by up to 10,000 men. |
| The Great Wall is 4,500 miles
long -- the distance between Miami and the North Pole. |
| The estimated cost of the Ming
Great Wall is $360 billion, or roughly what's been spend on America's
interstate highway system in the last 40 years. |
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