Ring of Brodgar by bluestardrop - Andrea Mucelli

The Ring of Brodgar (or Brogar, or Ring o' Brodgar) is a Neolithic henge and stone circle on the Mainland, the largest island in Orkney, Scotland. It is part of the UNESCO World Heritage Site known as the Heart of Neolithic Orkney. it is generally thought to have been erected between 2500 BC and 2000 BC, and was, therefore, the last of the great Neolithic monuments built on the Ness. The circle is 104 metres (340 ft) in diameter, and the third largest in the British Isles.[6] The ring originally comprised 60 stones, of which only 27 remained standing at the end of the 20th century. The tallest stones stand at the south and west of the ring. The stones are set within a circular ditch up to 3 metres (9.8 ft) deep, 9 metres (30 ft) wide and 380 metres (1,200 ft) in circumference that was carved out of the solid sandstone bedrock by the ancient residents.