The DMZ is a 234-mile long, 3-mile wide piece of no-mans land, that runs along the 38th parallel of latitude, surrounded by a massive concentration of military force. At present it is controlled by the UN and separates communist North Korea from capitalist South Korea – two countries still technically at war. It is the last and final frontier of the Cold War. More strangely still, it is one of South Korea’s most popular tourist destinations.