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From Woodhenge to Chichen Itza, 10 Great Ancient Ruins that Track the Heavens
As they have for centuries, ancient ruins around the globe aligned with the sun this month. Like fine-tuned Swiss watches, they marked the solstice, indicating the beginning of summer in the northern hemisphere. Researchers and travelers are paying more attention to these archaeoastronomy sites, which operate like giant calendars to note the passing seasons.
