Stonehenge in Salisbury Plain in Wiltshire, England. Free public domain CC0 photo. https://www.rawpixel.com/image/6017983/photo-image-public-domain-circle-freeFree Image from public domain license
Mulfra Quoit or Cromlech, Cornwall by John Wheeley Gough Gutch https://www.rawpixel.com/image/14313179/mulfra-quoit-cromlech-cornwall-john-wheeley-gough-gutchFree Image from public domain license