Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

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

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."

An oasis of calm amid the chaos of the boardwalk, the museum traces the heritage of this beloved beachside amusement park.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

This iconic tattoo shop has its own onsite museum with artifacts from the early history of modern body art.

Abandoned power station once home to a squatter community, now being developed into an arts center.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

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

This empty Victorian manse on Staten Island is said to be haunted but is actually a real life crime scene.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

Mysterious 500-year-old tapestries depict a unicorn hunt.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

Hidden deep within New Jersey Pine Barrens is a massive graffiti wonderland.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

The remains of an old sawmill, gristmill and the surrounding industry dating back to the 18th century.

Tucked behind New Jersey's abandoned Gingerbread Castle lie the eerie ruins of a once-flourishing paper mill.

Amazingly, this old machine within the Resorts Casino still functions.

A "Bugseum" dedicated to all things insect-related resides behind a pest control company.