The origin and history of the Great Wall

The origin and history of the Great Wall

The Great Wall is an ancient defense project with the longest construction time and the largest engineering quantity in China and the world. Since the 7th and 8th century BC, it has been continuously constructed for more than 2000 years. It is distributed in the vast land of northern and central China, with a total length of more than 50000 kilometers. It is known as "up and down for more than 2000 years, across more than 100000 li