Archaeologist Ben Robinson flies over the Broads where aerial photos have discovered a staggering 945 previously unknown ancient sites. Many are making historians rethink the history of the area. The fate of the Roman town of Caistor St Edmund has puzzled archaeologists for decades. It's long been a mystery why the centre never became a modern town. Now archaeologists have discovered a key piece of evidence. And near Ormseby, the first proof of Bronze Age settlement in the east of England has been revealed.