Many of you may aware that one of the Seven Wonders of the World - the Great Wall of China is protected by special guards. However, during the middle ages, the wall was protected by special group of men. This group of men not just guarded the Great Wall of China, but also dedicated their lives. The group lived there from birth to death. They grew up, worked as guards, get married, had children, and died there. In fact, the dead guards were buried in the wall itself.