Secrets - Season 1 Episode 5 A Viking Map?

The Vinland Map was allegedly created 50 years before Christopher Columbus set sail, but amazingly, it features the coast of North America. If it's authentic, it threatens to rewrite history as we know it. Join the investigation as our experts look for clues in the fabric of the map. They'll test the theory that the document is based on Viking maps created centuries before Columbus was born, and they'll name a 1930s scholar who may have faked the whole thing.