Whispering Gallery at Grand Central

Anyone know what I'm talking about?

If you don't, try this: got to Grand Central. Go to the Oyster Bar and at the main entrance, located on the ramp to the lower level, turn your back to the restaurant, look up, and you'll see a dome on four piers. If you stand with your face close into the corner of one of the piers, you can send a companion to the pier diagonally across the way and WHISPER to each other, and be heard all the way.

Nice, hunh?