Geologist Dr Iain Stewart presents a series showing how the rocks beneath our feet have shaped human history.
He takes us on a tour of the Mediterranean to show how salt is central to its history, playing a crucial role in everything from the existence of ice ages to the preservation of food and dead bodies in ancient Egypt.
His whistle-stop tour takes in many tourist destinations in Egypt, Venice and Sicily, but he provides a unique geologist's insight which can't be found in the guide books.
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