Great Wall of China, China

One of the seven wonders of the world, the Great Wall of China is an artificial structure that was built over two thousand years ago and took about 100 years to complete. The immensity of this project demonstrates the immense power of man.

Construction began in the fifth century BC is not actually a single wall, but many walls together, and extends over 4,000 miles. It was built to protect the Chinese Empire Xiongnu people in the north. The wall was originally built of stone, grass, earth and wood, but the bricks used were once production began. It is believed that about 2-3 million Chinese died during the construction project.