6/6 Ifor sets out to understand what happens when our religious urges drive us underground.
5/6 Ifor ap Glyn sets out to understand the appeal of islands as holy retreats.
4/6 Ifor ap Glyn visits shrines all over Britain to try to understand their appeal.
3/6 How trees and mountains show the journey Britain took from Paganism to Christianity.
2/6 Ifor ap Glyn finds out why water is often the essential element in our most holy places.
1/6 Ifor ap Glyn asks why we are drawn to holy ruins long after their religious use is over.