The Great Wall of China, spanning over 13,000 miles across northern China, stands as one of the most renowned and impressive feats of human engineering in history. Originally built over centuries to defend against invasions, the wall, in reality, offered little security, and scholars believe that its real purpose was to serve as political propaganda. Despite this, it continues to symbolise China's rich cultural heritage and resilience, and in 2007, it was recognised as one of the New Seven Wonders of the World. It also appeared on the list of Seven Wonders of the Middles Ages.