Dan talks to Cat Jarman, a scientist who has worked to establish whether the bones in the charnel house at Repton are those of Ivar the Boneless' Great Heathen Army.
Dan talks to Ali Ansari about the history of Iran, and discovers just how much of it there is. In this episode he focuses on Iran in the eighteenth century and its interaction with European powers.
Dan Snow explores the Viking history of Lofoten, an archipelago and a traditional district in the county of Nordland, Norway. Lofoten is known for a distinctive scenery with dramatic mountains and peaks, open sea and sheltered bays, beaches and untouched lands.
Sarah Parcak is 2016 TED Prize winner, Space archaeologist, Professor, scientist, Egyptologist, TED Senior Fellow, and National Geographic Fellow.;This is the final of the 4 part series timed to coincide with the upcoming broadcast of ' The Vikings Uncovered ' on BBC1 and PBS.