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Visitors enjoy the sunrise during celebrations of the summer solstice at Stonehenge, on June 21, 2025 in Wiltshire, England. On the longest day of the year in the Northern Hemisphere, the sun rises in perfect alignment with the Heel Stone and Altar Stone of Stonehenge's 5000-year-old circle. This alignment shows the ancient builders' understanding of the solar calendar and suggests Stonehenge may have served as a calendar or temple for important dates and events – a tradition that continues to be marked each year. (Photo by Finnbarr Webster/Getty Images)
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