Countries and states fact

At Chichén Itzá, a shadow serpent appears on the pyramid at the equinoxes.

The details

Around the spring and autumn equinoxes, afternoon sunlight on the stepped pyramid El Castillo casts triangular shadows that look like a snake sliding down the staircase toward a carved serpent head at the bottom.

Source: El Castillo, Chichen Itza (Wikipedia)

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