Who were the Celts really? Mythical druids of legend or feared warriors of antiquity? Deep inside the European Alps, sealed salt mines have preserved astonishing evidence of a powerful civilisation that flourished more than 3,000 years ago. These people were neither barbarians nor island dwellers -- they were the rulers of a vast Kingdom of Salt, enriched by one of the most valuable resources of the ancient world. Now, a remarkable discovery raises new questions. Inside a 2,400-year-old Celtic tomb, the remains of an aristocratic woman and two unusually large men are uncovered. Were they relatives, ritual sacrifices, or part...