Eccentric stone cairns built on a public New York City beach.

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

This abandoned artificial island off the coast of New York City is now home to dozens of harbor seals.

Failed state-supported institution meant to rehabilitate students with intellectual disabilities.

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

Once America's longest-manned military fort, now an abandoned hulk.

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

The longest step street in the city.

Legendary private island in the Bronx...devoid of rats.

This old estate is a remnant of when the Bronx was a popular summer destination for wealthy New Yorkers.

Small monoliths of several varieties of stone sit alongside a wooded path in the Bronx.

A former connection to City Island, it has been abandoned since the 1930s.

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.

The loneliest island in New York.

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

A graffiti Mecca welcoming artists from around the world.

This Queens hospital has stood abandoned for almost 20 years after its patients were secretly relocated in the dead of night.

A long abandoned hospital building on the outskirts of NYC.

Out of a labyrinth of abandoned tunnels and stops, this Queens subway station is arguably the most mysterious—if it exists at all.

A former seaside jewel built for the everyman is now simply a neglected art deco fortress.

A New York warehouse filled with an enormous amount of goods saved from the landfills and donated for creative use.

A once crucial portion of the Long Island railroad still lays abandoned, waiting to be turned into an urban park.

Holding the most bodies of any cemetery in the United States.

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