Absence of sound is, these days, a pretty unique experience. I used to go to the Great Sand Dunes about once a year on family trips, and it gets extremely quiet there (Shhhhh. You Hear That? That's The Sweet Silence Of The Great Sand Dunes, On Track To Become The First 'Quiet Zone' In The US).

An escalator at the Ashby BART station in Berkeley used to make a sound that would make a very funky loop. I’m not sure I ever recorded it, and I think it has since been “fixed.”

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