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."
Terry Jones' Great Map Mystery (2008) is now streaming with subscription on Freevee