Stonehenge in the west of England is undoubtedly the king of stone circles — stone monuments originally set out in a way to form a circle or ellipse.
However, it's easy to overlook the dozens of other stone circles which can be found across the British Isles and even as far afield as Israel.
There are more than 1,300 stone circles in Britain, Ireland, and Brittany alone. Their purpose is often mysterious, but it is believed that many were used for religious rituals.
We gathered 15 other stone circles — one of which is underwater — that demonstrate the diversity of neolithic monuments.