In this season viewers travel around the world to uncover the remarkable stories that have changed the course of history. Preserved in Italy's Turin Cathedral is one of Christianity's most cherished relics - the Turin Shroud. Believed to be the burial cloth in which Jesus Christ was wrapped following his crucifixion over 2,000 years ago, the Turin Shroud could be the key to proving the existence of Jesus Christ. But is it real or are there other explanations that could explain its mysterious properties? Considered one of the greatest wonders in the world, pyramids can be found across the globe in places such as Egypt, Cambodia, Greece, Sudan and Italy. But how much do we really know about them and did each of these different civilizations independently create the same structure or were they given a blueprint by a common ancestor?