A circle made of stones arranged vertically, often around a tomb or place of worship. Cromlechs were erected in the Neolithic and Bronze Age, most often in the areas of Brittany, England and Ireland, but also spread to other regions of Europe, Africa and Asia. The first of them appeared in the second half of the fourth millennium BC. It were most likely a place of worship and tribal gatherings. They were often orientated along the rising or setting sun or moon at certain times of the year. After 1500 BC their construction was stopped. The reason may be migration movements or the emergence of new religions.
