Did you know an estimated 750,000 people per day pass right by Grand Central Terminal's best kept secret, which is worth between an estimated $10 to $20 million dollars?

No, it has nothing to do with the absolutely amazing artwork that adorns its ceiling, nor does it have anything to do with Grand Central's basement-- which is the largest in all of New York City.

Can't figure out what else it could be? Watch the revealing short video below by WNYE's Secrets of New York to find out.

If you enjoyed this article, check out 17 Facts New Yorkers Don’t Know About the Flatiron Building!