MICHAEL MARTEN / SCIENCE PHOTO LIBRARY MICHAEL MARTEN / SCIENCE PHOTO LIBRARY
Standing stones. Sheep grazing beside three standing stones. These stones may have been used to predict seasonal cycles and astronomical phenomena. Photograph of the stones of Stenness in the Orkney Islands, off the north coast of Scotland. The Orkney islands have been in continuous habitation since the stone age and the archipelago has numerous archaeological remains.
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