Great Skellig Island, Ireland, 1977

A thousand-year-old headstone stands next to the ruins of an ancient church on Great Skellig Island, off the southwest coast of Ireland. Between the sixth and ninth centuries, the Celtic Christian church spread through Ireland, and the remains of the original monasteries have been preserved on islands like these of Kerry County.

(Photo shot on assignment for, but not published in, "The Celts," May 1977, National Geographic magazine)