SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Standing stones at Pentre Ifan in Pembrokeshire, Wales. This Bronze Age monument dates from around 4000-3500 BC and is thought to be a burial chamber that has been denuded of the mound of earth that would have covered it. The capstone of the chamber is about 5 metres long and is supported on the tips of three upright stones.
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