Stretching some 21,196 kilometres across the sweep of Northern China and delineating the edge of the Mongolian Steppe, the Great Wall of China is a staggering feat of engineering and ingenuity – a vast system of fortifications unrivalled by any other human construction. Seeing the entire wall is a massive undertaking, but that’s exactly what the new UK documentary Great Wall of China: The Making of China proposes to do, starting in the East at Old Dragon’s Head in the small town of Shanhaiguan in Hebei province, on the shore of the Bohai Sea, to the distant deserts of Ningxia in the far West. It’s a fascinating voyage, with chatty host John Nettles (Midsomer Murders) apprising of the Wall’s colourful history and current conditions along the way.