China The Great Wall

The Great Wall of China, built over 2000 years ago, stretches across the mountains of modern China, winding north and northwest of Beijing.
The Great Wall of China was built to link existing fortifications into a united defense system and better keep invading Mongol tribes out of China. It is the largest man-made monument ever to have been built and it is disputed that it is the only one visible from space. Many thousands of people must have given their lives to build this colossal construction.