Over many years and many journeys, Daniel Schwartz has patiently and meticulously photographed one of mankind’s supreme monuments – the Great Wall of China. Schwartz was the first foreigner ever to be allowed such privileged access to the Wall. He said at the time: ‘I wanted to find out where the boundaries of the impossible lay and how close I could get to them.’ Recently, China’s new policy of openness encouraged him to revisit the Wall and to photograph areas that had been closed even to him on previous journeys.