-- amazing facts continued --

• It's long be rumored that dead were buried in wall. Not true. Decomposing bodies would have weakened structure.

• One section of the Wall ascends mountain ridges that climb at an angle of 70 degrees and are 7,000 feet above sea level.

• The estimated cost of the Ming Great Wall is $360 billion, or roughly what's been spent on America's interstate highway system in the last 40 years.

• Using satellite data scientists have rediscovered more than 600 miles of buried Wall in the past decade.

• The Ming Wall reportedly took close to 200 years to complete.

• The Great Wall's height averages from 15 to 30 feet high it's width averages from 15 to 25 feet wide with about a 13-foot wide roadway on top.

• Three million people--70 percent of China's population at the time--was involved in building the Qin Wall