Chichen Itza Chirp in Chichen Itza, Mexico

The Mayan city of Chichen Itza is full of architectural and engineering marvels. Every equinox, an enormous snake born from the shadows slithers down the side of the Temple of Kukulcan. But the pyramid does more than put on this biannual light show.

Clap your hands at the base of the stairs, and an echo will ring through the air. It isn't an ordinary booming echo, either. It sounds like the song of a ghostly flock of birds, a chorus of chirps that crescendos before fading into silence.

The...

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