Uploaded December 2023 | Updated September 2026, 14 hours ago

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Chichen Itza (Mexico): The ancient Mayan city of Chichen Itza is famous for its pyramid, El Castillo. During the spring and fall equinoxes, the play of sunlight and shadow creates the illusion of a serpent slithering down the pyramid's staircase. The precision of this architectural feat is still a source of mystery.

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