The architecture of ancient civilisations was largely dictated by the types of rocks that were accessible to their builders. Iain Stewart reveals how geology influenced the Egyptians to build pyramids, the Greeks to build squares and the Romans to build perfect arches. It all comes down to how the rocks were formed millions of years ago. Filmed in Egypt, Italy and Greece. Geology has had a huge influence in shaping the history. Early cave painters scraped their colours from rocks on the earth’s surface.In this series he takes us on a tour of the Med and shows us how geology is behind everything from the rise and fall of civilizations to religion, architecture and food.