0 a circle of large stones, usually standing stones, put in position by people in prehistoric times (= the period before there were written records):
Less than a mile to the northwest is another stone circle, the Ring of Brodgar, dramatically sited on raised ground.
About 3000 B. C., even before the stone circle was built at Stonehenge, wooden posts were erected.
This region of Portugal is scattered with prehistoric remains, including over a dozen megalithic sites with dolmens, standing stones and stone circles.
