The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

Jimi Hendrix's legendary recording studio in Greenwich Village.

A Ukrainian church canteen doles out hearty fare in an East Village basement.

The East Village tenement from the cover of Led Zeppelin’s 1975 album has a tea shop on the ground floor.

A legendary speakeasy bookstore returns from the brink.

NYC's legendary underground network for bovine transportation.

The best way to get a sneak peek at the movies.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

Once thought to be the fabled Holy Grail, it is now known to be an oil lamp.

You don't have to be an ambassador to dine like one.

Underneath the bustling city streets, a hydroponic farm grows unique herbs in an urban oasis.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

There's a piece of New York City transportation history hidden in plain sight at a Manhattan subway stop.

An accidentally hidden library containing the ephemeral history of New York.

A huge resale shop for the cast-offs of the film & television industry.

A garment factory hides a small Dominican eatery in the hallway to its freight elevator.

The home of aviation trailblazers, in a remote corner of the big city.

Some of New York's best tacos can be found in the back of an unassuming bodega in Queens.

Behind a grungy bodega facade, a Poblano family serves rich, home-cooked meals.

A B.Y.O.B. Mexican cantina lives inside one of the last tortilla factories in Brooklyn.

A retired subway car stands alone in a field in the middle of Queens.

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

The last remnants of what was once one of the world's grandest hotels can now be found in a Manhattan subway station.

Final resting place of two dozen New York City harbor ships.