Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

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

This small road tunnel is the only place where you can cross beneath the Erie Canal.

An abandoned tuberculosis hospital moulders on into an uncertain future.

A forsaken wonder in the middle of the East Side neighborhood.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

The remains of what was once the world's steepest passenger funicular.

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

This abandoned factory on the Hudson River once churned out a million bricks a week.

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

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

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

This once luxurious Catskills resort is now a haunting ruin.

This Central New York ghost town was once a prosperous railroad community.

Abandoned rock quarry now a haven for mountain bikers and hikers.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

A historic recreation of the golden age of the Erie Canal, abandoned for some time, slowly being restored.

These mouldering mansion ruins remember a time when the Catskills were nothing but luxury.

An abandoned castle owned and ignored by Masons carries a cursed history.

This once sprawling resort now sits abandoned, filled with graffiti and vibrant colors from an era long passed.