In August 2011, an expedition in the Gobi Desert region of Mongolia uncovered a long-forgotten section of the Great Wall of China. In 2015, nine new sections of the wall were located in northwest China. Researchers and archaeologists have worked for years to uncover the secrets of this incredible ancient structure. How was this massive wall created? Who exactly built it and why? Centuries of study have led to many theories and ideas, but some questions may never be answered. Find out more about the myths, history, and science surrounding the Great Wall of China.