The Callanish standing stones (Calanais in Gaelic) are a cross-shaped array of slim stones, centred on a circle of taller stones. The remains of a chambered tomb are in the centre. They were erected 4500 to 5000 years ago, making them one of the oldest man-made structures in Britain (or anywhere).
About 1000 years after it was constructed, the site was abandoned, and with a change of climate, the site gradually became blanketed with peat to a depth of about five feet, partly burying and preserving the stones. In the 19th century, with greater interest in monuments, the peat was removed and the site taken into State care.
The tall slim stones, with their mysterious alignments are an unique and striking sight. Well worth a visit.