William Lindesay has documented the danger facing China’s Great Wall in a series of stunning photographs. After digging up photographs and drawings made over the past 200 years, Lindesay has gone back to the same spot and retaken the same image. After recounting his 2,470 km trek along remains of the Wall, in the 1989 book Alone on the Great Wall, Lindesay founded International Friends of the Great Wall, a group of enthusiasts dedicated to preserving its glories. It has taken him five years to hunt down and capture 65 pairs of images of places scattered across the breadth of China. Confronted by this fresh evidence of the acute threat, the Chinese government is taking action but is it too late to save the Wall? This is the story of Lindesay’s journey.