This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

Unrepaired walls from a 1920 anarchist bomb attack.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

A bit of retro transportation flair preserved in the world's largest department store.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A celebration of capitalism in Midtown.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

A hip bar decorated with walls of golden skulls.

A hands-on traveling collection of the innovative devices of yesteryear.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

Homestead Cemetery hold the remains of the United States' first known professional tattoo artists.

The maximum security facility was once thought to have "the bloodiest 47 acres in America."

This historic cliffside mansion uses a natural cave for air conditioning.

Step back in time at this 1950s display home, built to showcase once cutting-edge electric amenities.

This mansion was made famous by its colorful cast of owners and location along the Sante Fe Trail.

A remarkably opulent mansion with a tragic history.

The ruins of a 19th century shelter run by the Independent Order of Odd Fellows.

This statue pays tribute to the iconic musician in the place where he recorded his final studio album.