Ancient, mysterious, and fascinating in their varied forms, the holy wells in these photographs range from almost invisible rock-strewn holes to startling rocky outcrops. Historical notes and selected poems by such authors as Rowen Williams and R. S. Thomas are used to explain the significance of the 42 wells featured, which were originally used in pagan rituals before they were attached to early Christian churches. Commercialized spas and full-blown pilgrimage destinations, such as Holywell in northeast Wales, are also shown, along with an environmental message about protecting these fragile geological sites.