Hear the tales of New York's most notorious criminals.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

This once luxurious Catskills resort is now a haunting ruin.

The site of a tragic massacre that spawned a multimedia franchise.

An unrealized dream to wirelessly electrify the entire Earth.

An abandoned asylum where patients have been forgotten but their possessions remain.

This abandoned subway station can still be seen on regular commuter trips.

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

The loneliest island in New York.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

The "Seinfeld" diner.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

A once grand hotel is being retaken by the wilderness it once capitalized on.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

A hidden piece of Altoona's railroad history in a long-forgotten abandoned town.

Descendants of this colonial Pennsylvania family still travel from far and wide to visit the 300-year-old home of their Quaker ancestors.

No one knows who painted this mysterious mural in a Penn State basement.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.