In addition to the architectural splendor, Grand Central’s Guastavino vaults renewed our sense of wonder as we played with the sound reverberations during a recent conference.

The next time you and a friend are passing through the vaults, each stand in opposite corners and speak in a normal tone. When you do this, regardless of how many people are crossing this intersection, you can hear and speak to the other person you as clearly as if you were standing next to them.