Callanish Stone Circle, Isle of Lewis, Outer Hebrides, Scotland

This aerial view of Callanish shows the site's resemblance in form to a Celtic cross. Only the north alignment leading out from the center has an intact double row. This may have been used for processions toward the circle. The famous West Kennett Avenue at Avebury is speculated to have served a similar purpose. The photo is copyrighted by Colin Baxter and appears in the book, "Scotland from the Air."