The Great Wall Scenery Royalty-Free Stock Image

The Great Wall was built in the spring and Autumn period, which lasted for more than 2000 years, with a total length of more than 50 thousand km. It is the world's longest construction time, the largest amount of an ancient defense project. Thus in a few hundred years ago, Colosseum, Leaning Tower of Pisa, and so on as one of the seven wonders of the ancient world. Hebei, china.