When China built the Great Wall?

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In the third century BC the Chinese began building the Great Wall, at the initiative of Emperor Shih Huang-Ti, in order to defend themselves from attack by the Mongols and other invaders. Its construction lasted until the seventeenth century. Arranged along the border has a length of 2,400 kilometers. Its construction was carried out by stages. Initially two deep furrows were separated by a distance of approximately seven meters. These excavations were placed large granite blocks which stood on brick walls, and the space between two walls was filled with soil. Each mile is up a tower of 14 meters. This wall could not fulfill its advocacy role, because it was covered with towers 25 000 15 000 staff checkpoints, but facilitated the movement of Chinese troops across the border.

What are its dimensions?

The maximum height is 9.15 meters, while the average width at the base is 7.5 m and the straight line distance between its ends is 2,400 miles.

This solid construction started 22 centuries ago is considered one of the wonders of the ancient world.

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