Iona, by Peter Millar. This essential companion for all pilgrims and visitors covers all the principal sites on the island of Iona - one of world's most visited holy places. Every Wednesday, there is a pilgrimage around the island and this guide follows its route, stopping at all the principal sites to reflect on the island's history rooted in Celtic spirituality, and to pray for the needs of the world. Paperback Edition. Number of Pages 64 Size: 198mm high x 126mm wide x 11mm thick. The text is by Peter Millar, a Church of Scotland minister and formerly the Warden of Iona Abbey. A member of the Iona Community, he now lives in Edinburgh. The photography is by Martin Guppy who is well-known for his range of calendars and greeting cards featuring Scottish landscapes.