There's a small room in Minnesota that blocks out 99% of all external sound. That's an impressive number! Also impressive: nobody can take more than 45 minutes alone in the room before they go nuts.
The Daily Mail describes Orfield Labs' anechoic chamber—perfect for making extremely sensitive audio measurements. But also perfect for sending you into a hallucinatory hell so hellacious you'll need a chair:
http://gizmodo.com/5899502/the-quietest-place-on-earth-will-drive-you-insane-within-45-minutes
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