This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

MANHATTAN — We’re about halfway through the much-needed revamp of Manhattan’s Penn Station.

Whether you’re a commuter or just there for the Krispy Kreme donuts, you’ve seen the changes going on.

Renovations have included opening up the station’s original nooks and crannies — and you can only imagine that there were some secrets found.

Justin Rivers from Untapped Cities Tours is a Penn Station enthusiast and takes us on a tour of the iconic station.

Passageways were closed because of crime in the 80s, but just a few weeks ago, the forgotten passage was spotted — open.

It may not look like much, but these are the last remnants of the Guastavino tile work in Penn Station.

Raphael Guastavino was an iconic New York architect.

He and his son came to New York from Spain in the late 1800s and set New York on fire with vaulted Catalan arched ceilings.

But all hope is not lost.

Guastavino’s tile work still remains intact in several places, including the Ellis Island waiting room, the Elephant House at the Bronx Zoo and one of the best places to see it? The Whispering Gallery at Grand Central!

If you’re adventurous, you can go in search of that glass door in Penn Station to see the tiles for yourself.

If you’re hanging around the Long Island Railroad Concourse, just head to the southbound No. 1 train platform.

You’ll have to swipe through the turnstile with your metrocard and then head up the stairs for a peek of this little piece of New York City history.