The Great wall of China was built over 2,000 years ago .The length of the great wall is 3,100 miles long and it took 10 years to build.The great wall is not just one wall.In 2009 new technology uncovered 180 additional miles of the Great wall but the length is
The Great wall of China was built over 2,000 years ago .The length of the great wall is 3,100 miles long and it took 10 years to build.The great wall is not just one wall.In 2009 new technology uncovered 180 additional miles of the Great wall but the length is