Because the continuous construction of the Great Wall takes a long time, the amount of work is large, the construction is arduous, and the historical and cultural connotation is rich, which is really incomparable to other ancient projects in the world. Commenting on the Great Wall, Sun Yat-sen, the great pioneer of China's modern democratic revolution, said: "The most famous engineer in China is the Great Wall of Wan Li. ..... This project is unparalleled in ancient times and the only miracle in the world. " Former US President Nixon said after visiting the Great Wall: "Only a great nation can build such a Great Wall." Therefore, the Great Wall, as a miracle of human history, was included in the World Heritage List at 1987, and it deserved its name.

Such a huge project is unique not only in China, but also in the world, so it was listed as one of the seven wonders of the Middle Ages with the Colosseum and the Leaning Tower of Pisa hundreds of years ago.