This small, hidden cove is home to abandoned boats.

One of only two remaining Victorian-era greenhouses in New York.

A mysterious, abandoned building rotting on the Brooklyn waterfront.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

Buffalo's abandoned concrete grain elevators are getting a second life.

Run by a eugenics advocate, this aging institution conducted secret radiation experiments sponsored by Quaker Oats.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

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

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

This natural rock "church" might not be a proper chapel but that doesn't mean it's not beautiful.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

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

The macabre graffiti spectacle in a quarry in a Massachusetts forest reservation.

Arlington Cemetery exhibit dedicated to death and grieving.

An abandoned stretch of highway, deteriorating next to the operational one.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

An abandoned asylum once on the cutting edge of lobotomies may be reborn as a Christian college.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

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