Inside NYC's Secret Skyscraper

If you ever stroll around Lower Manhattan, you might find yourself on Thomas Street. And if you walk past 33 Thomas Street, you'll pass the most mysterious skyscraper in NYC.

It's a 45-story hulking brutalist pile that looks like a weird Lincoln Log and looms over its immediate vicinity. It has no windows. No ornamentation. Whereas most skyscrapers are gleaming with glass, inviting glares and glare, this one ... doesn't. It seems to be purposefully, aggressively shutting, out the world.

And, if fact, that's exactly what it's doing. 

In fact its an AT&T building that was originally built to connect long-distance phone calls and oversee phone networks. Today it does something similar for the digital age. 

And it's also apparently built to withstand a nuclear attack in order to keep society functioning and communicating. It is, so to say, "apocalypse proof."

So here's a little inside look at NYC's secret skyscaper.