CHRIS MADELEY / SCIENCE PHOTO LIBRARY CHRIS MADELEY / SCIENCE PHOTO LIBRARY
Standing stones at Pentre Ifan in Pembrokeshire, Wales. This Bronze Age monument, also known as Arthur's Quoit, dates from around 4000-3500 BC. It is thought to have been constructed as a burial chamber and would have originally been covered in earth. The capstone of the chamber is about 5 metres long. Photographed in Pembrokeshire Coast National Park, Wales.
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