Joanna Lumley embarks on an epic journey overseas to investigate one of the oldest and most famous stories in the world - Noah's Ark. Was there a global flood and where did it happen? What was the 'Ark' ship like and where is it now? The story of Noah has fascinated many adventurers and explorers who have gone in search of the Ark - from Marco Polo to Sir Walter Raleigh, and more recently NASA astronaut James Irwin. But beyond a physical search for the ship, Joanna is also keen to unearth the symbolism of the story.