Terry Jones' Great Map Mystery is a four-part television documentary series first broadcast on BBC Two Wales in 2008 and presented by ex-Python Terry Jones. As described on the BBC's website, "Terry Jones sets out on a series of journeys through Wales following the world's first road atlas: John Ogilby's Britannia, published in 1675.Episode 4: Chester to HolyheadBBC's episode description: "The final leg of Terry Jones' journey following a 17th Century road atlas is the most hazardous of all. Terry becomes the first person to follow this route successfully for 180 years. At the end of his journey, he finally uncovers the deadly political plot which was the real purpose of the map."