Walking along a section of the Great Wall built in the Ming Dynasty (1368-1644) in Datong Hui and Tu Autonomous County in Xining City, northwest China's Qinghai Province, Tian Shenglong snapped photos of the ancient remain, recording every detail. As a volunteer protector of the Datong section of the Great Wall, Tian attends special training sessions on Great Wall protection every year. "When I was a child, few people knew that the 'side wall' not far from where we lived was actually a part of