40 Secrets Residing Inside Popular Buildings That Most People Have No Clue About

Grand Central Station

Mesmerizing!

That’s the only word that can describe walking down this famous train station. On a daily basis, almost 750,000 people walk through this station. Those seemingly infinite hallways and that crowd make that place exciting. But the thing that remains hidden to the naked eyes is a secret that is hidden beneath this station, but no one is able to visit that place.