Mystery of the Chirping Pyramid Solved
Ant writes "Nature says the mystery of the 'chirping' pyramid has been decoded. Acoustic analysis shows how the temple transforms echoes into sounds of nature. El Castillo's strange echoes have fascinated visitors for generations. A theory that the ancient Mayans built their pyramids to act as giant resonators to produce strange and evocative echoes has been supported by a team of Belgian scientists."
A corrugated-steel wall produces this effect quite distinctly.
Warning: this article may contain humor, sarcasm, parody, and perhaps even irony. Read at your own risk.