Simple plan of the Callanish Stones (Callanish I), on Lewis in the Outer Hebrides, Scotland. Based on that in James Fergusson (1872) "Rude Stone Monuments in All Countries: Their Age and Uses" page 259. The original was apparently drawn by Henry James, but he made some mistakes (such as the alignment of the central tomb), so I've made some small adjustments to bring this plan up-to-date.