Can modern explorer, Nicholas Crane, decipher the mysterious symbols of the medieval Gough Map and use them to lead him safely through some of the wildest Welsh landscapes of today?
Created in the time of Geoffrey Chaucer, the Gough Map is both a real mystery and a landmark in map-making. It was still in use two hundred years after it was drawn. Who was the map-maker and why was it made? Nick explores the mysterious red lines along the coast? Why is there a massive green wilderness dominating the centre of the country? Can Nick use this ancient map to find his way on foot from Snowdon to St David's?