National Geographic China's Great Wall: The Great Wall of China is a stone witness to both the strengths and weaknesses of China. This 2-part documentary, shot in high-definition, reveals the source of the myths, legends and technological marvels behind this massive, awe-inspiring structure. Using rare aerial shots, lavish reenactments and state-of-the-art CGI, this in-depth program provides a visually breathtaking look at the most well-known symbol of China.