The Great Wall

The Great Wall is the official name  , As we know that is located in China  was built by Qin Shi Huang in 220-206 BCE , Has concluded that the ming wall mesur 8,850 km , this made up of 6,259 km sections of actual wall , 359 km of trenches and 2,232 km of natural defensive barriers such as hills and river .

They used different materials to built it " it was made from stone , brick , tamped earth , wood and other materials  .

And the most important fact that the wall has built as individual walls in the beginning and then they joined them together and made it bigger and stronger , They used as border control .