Visit the site of a subway powered by nothing more than air--and lots of it.

A retired subway car stands alone in a field in the middle of Queens.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

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

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

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

Records of the dead describe the myriad odd ways people used to die.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

Rummage through this sunken ship, but leave your scuba gear at home.

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

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

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

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."

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

A crumbling hospital from the 1850s on Roosevelt Island.