It's one of the most iconic structures in the world: The Great Wall of China.

But is it just one wall? And who built it and why? Today, Tristan Hughes is joined by William Lindesay OBE to delve into the ancient history of this epic structure and to answer these questions and more.

Together, they uncover the origin story. From the Warring States around 300 BC to the Qin Dynasty and China's first emperor, and then to its expansion during the Han Dynasty. They explore the evolution of the walls' symbolism and significance, the role it played in protecting against nomadic threats, through to modern day conservation and protection efforts and how important it is to understanding China's military and cultural history.

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