Hitting the Wall yet? Runners compete in the Great Wall marathon at Huangyaguan (Yellow Cliff Pass) Great Wall of China in Tianjin. The race is regarded as one of the most challenging marathons in the world. Photograph: STR/AFP/Getty Images

Had you so wished, you could have run a marathon through the Gaza Strip which, at 41km long, is almost perfectly marathon-proportioned. That wa(...)