An antiquarian, inventor and pioneer photographer, Alfred Watkins was a born and bred Herefordian who knew the county's roads and byways like the back of his hand. On June 30 1921 Watkins had an extraordinary revelation. As he stood on a Herefordshire hillside, it came to him that straight lines of sight criss-crossed the landscape, connecting ancient and spiritual sites. He christened them ley lines and regarded them as we might imagine a Neolithic Sat Nav – straight tracks enabling our ancestors to situate themselves in the landscape and navigate through it.