Unsolved mysteries (part 3)

In our third and final week looking at great unsolved mysteries Peter and Russell visit the Antikythera Mechanism. This complex analogue computer could predict astronomical positions and eclipses decades in advance. Then off to Peru and the mystery of the Nazca Lines. Why would people carve 70 different images into the Earth? Was this a way to communicate? Who would have done it? Join us as we talk about another two great mysteries.