One of the seven wonders of the world, the Great Wall of China is a man-made structure that was constructed over two thousand years ago and took about 100 years to complete. The Great Wall of China, one of the greatest wonders of the world, was listed as a World Heritage by UNESCO in 1987. The vastness of this project brings to light the immense capabilities of man. Great Wall of China is a series of stone and earthen fortifications in northern China, built originally to protect the northern borders of the Chinese Empire against intrusions by various nomadic groups. Several walls have been built since the 5th century BC that are referred to collectively as the Great Wall, which has been rebuilt and maintained from the 5th century BC through the 16th century.
