Ash investigates one of the oldest sections of the Great Wall in Zhangjiakou, which has been fortified by eight successive dynasties and delves into the footsteps of ancient explorers in Wulong.
Ash camps near the Qin section of the Great Wall, waits for the sun to rise, wrestles with an Inner Mongolian champion, learns desert survival techniques from an expert and searches for a lost city.
Following the Great Wall west, Ash heads to Inner Mongolia to meet up with a nomadic family and to try Mongolian wrestling; he's hoping to visit Naadam Festival, which features a key part of Mongolian culture, horse racing.
Ash heads into the desert to meet up with Wu Xinlei, who is a survival expert; he's hoping to understand what it would have been like for the people who built The Great Wall in this remote and punishing landscape.