Aerial image of Avebury, Neolithic Monument, site of a large henge and several stone circles, UNESCO World Heritage Site, Wiltshire, England, United Kingdom, Europe

Drombeg stone circle site, County Cork, Munster, Republic of Ireland, Europe

Neolithic stone circle and henge at Avebury, UNESCO World Heritage Site, Wiltshire, England, United Kingdom, Europe

Neolithic stone circle and henge at Avebury, UNESCO World Heritage Site, Wiltshire, England, United Kingdom, Europe

Neolithic stone circle and henge at Avebury, UNESCO World Heritage Site, Wiltshire, England, United Kingdom, Europe

Neolithic stone circle and henge at Avebury, UNESCO World Heritage Site, Wiltshire, England, United Kingdom, Europe

Standing stones in south east quadrant neolithic stone circle henge prehistoric monument, Avebury, UNESCO World Heritage Site, Wiltshire, England, United Kingdom, Europe

Neolithic stone circle and henge at Avebury, UNESCO World Heritage Site, Wiltshire, England, United Kingdom, Europe

Pentre Ifan Burial Chamber, Preseli Hills, Pembrokeshire, Wales, United Kingdom, Europe

The stone circle, Ring of Brodgar, UNESCO World Heritage Site, Orkney Islands, Scotland, United Kingdom, Europe

The Standing Stones of Stenness, UNESCO World Heritage Site, Orkney Islands, Scotland, United Kingdom, Europe

Stonehenge, Salisbury Plain in Wiltshire, UK attracts crowds on the longest day.

Stone Henge in the winter, Wilthshire, England.

Dolmen of Guadalperal. The monument is within the Valdeca�as reservoir in the Tajo River, Caceres, Spain

Dolmen of Guadalperal. The monument is within the Valdeca�as reservoir in the Tajo River, Caceres, Spain

Monumental stone gates in barren landscape, Arctic Henge, Raufarhoefn, Melrakkasletta, North East Iceland, Iceland, Europe

Ring of Brodgar, circa 2500 BC, Neolithic Stone Circle, Henge, UNESCO World Heritage Site, Orkney Mainland, Scotland, United Kingdom, Europe

Ring of Brodgar, neolithic henge and stone circle, Mainland, Orkney, Scotland, United Kingdom, Europe

Ring of Brodgar, circa 2500 BC, Neolithic Stone Circle, Henge, UNESCO World Heritage Site, Orkney Mainland, Scotland, United Kingdom, Europe

Monumental stone gate in barren landscape, Arctic Henge, Raufarhoefn, Melrakkasletta, Northeast Iceland, Iceland, Europe

Ring of Brodgar, neolithic henge and stone circle, Mainland, Orkney, Scotland, United Kingdom, Europe

Ring of Brodgar, part of the UNESCO world heritage site Heart of Neolithic Orkney. This neolithic henge monument and stone circle is one of the main attractions of the Orkney Islands. europe, central europe, northern europe, united kingdom, great britain, scotland, northern isles,orkney islands, June

Aerial view of Neolithic henge monument of Arbor Low, Derbyshire, England, United Kingdom, Europe