My favorite Grand Central easter egg is the 'Whispering Arch' by the Oyster Bar. Standing in one corner, you can speak into the wall and be heard by someone st

My favorite Grand Central easter egg is the 'Whispering Arch' by the Oyster Bar. Standing in one corner, you can speak into the wall and be heard by someone standing in the opposite corner. http://www.sonicwonders.org/whispering-walls-grand-central-station/ http://www.sonicwonders.org/whispering-walls-grand-central-s...