4/6. How has geology influenced the world around us? Dr lain Stewart tours the Mediterranean to show how the rocks beneath our feet played a crucial role in ancient civilisations, and remain a major influence on how we understand our planet - from the spread of Christianity to the extinction of dinosaurs. Stewart's tour visits tourist destinations in Greece, Italy and Portugal, but provides a unique insight that can't be found in the guidebooks.
Producer Paul Olding; Series producers Belinda Cherrington and Jeremy Phillips First shown on BBC4
