A monument in the Shetland Islands is one of the largest and most mysterious of Iron Age Britain. In Wales, a reconstructed hill fort and roundhouses echoes the way of European Celtic society, the people were warriors, but also farmers using iron tools – ones which we still use today. Roman writing tells of Britons who spoke a language similar to the Celts of Gaul and shared a class of religious leaders unique in the Celtic world – Druids. Two million people in Britain and Ireland speak a Celtic Language – the greatest number is Welsh. Does this make an even stronger connection between the people of the British Isles and Celts of Europe? In Ireland a rocky crag soaring vertically seven hundred feet out of the Atlantic Ocean sums up the unique spirit of what became Celtic Christianity.