So what happened to these Gods? Do powerful faiths just vanish? Can Gods die? Are these once sacred sites the final resting places for long-lost religions? And how can people who believed in so many deities for so long come to believe in just one and sweep the others to extinction?
The Celts
The Celts believed in benign spirits and demonic forces, but made no churches or temples: nature itself was their cathedral. Kenneally visits ancient Celtic settlements in Austria, Italy and Greece. He explores the settlement of Castell Henllys in Wales, where the religion of the druids was broken by Roman military might. And at Newgrange, Ferrycarraig and Dun Aengus in Ireland, he reveals how the Celts came to adopt the Gods of those who had preceded them.