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

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

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

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

A natural gas leak provides a flickering flame beneath a waterfall.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

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

Collapsing castle on the Hudson river was once the storage site of military surplus business.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A semi-scholarly approach to sex.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A crumbling hospital from the 1850s on Roosevelt Island.

Tucked in the back of this amazing antique store is an important piece of medical history.

According to local lore, this narrow passageway through two large rocks was accidentally created by the devil himself.

On Hilton Head Island this bronze King of the Sea rules all things briny—and lets you know if you’re late for lunch.

Charleston's historic city jail once held everyone from pirates to Civil War POWs.

The oldest bridge in South Carolina may have been designed by the same man who created the Washington Monument.

An eerily abandoned stone tower is all that remains of a demolished dam on Cape Fear River.