A whispering gallery found in a surprising place, Grand Central Terminal in New York. There's an area under 4 archways, on the way down to the lower concourse, where you can experience an amazing sound effect.
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Whispering galleries that involve sound have been around for a while. Famous examples include Grand Central Terminal and St.Paul's Cathedral in London, where the domed geometry of the rooms amplifies the faintest whisper to listeners well outside of earshot.