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

Teddy Roosevelt’s famous “midnight ride to the presidency" started at this small lake high up in the Adirondacks.

The shared home of a utopian commune that practiced "free love" a century before the hippies.

A gigantic 10-foot tall stone man.

A gazebo that inspired the fifth episode of the "Twilight Zone" still stands in the creator's hometown

A monument stands to the famous suffragist who penned the declaration for women's equal rights, including the right to vote.

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

A tiny islet just off Long Island offers a wealth of infectious curiosities.

Secluded amid upstate New York’s Adirondack Mountains lies this subterranean emblem of a nation on the brink of nuclear war. And it's for sale.

This study room in the New York Public Library saw the creation of one of contemporary America's greatest traitors.

A mysterious air force base built to resemble a Long Island fishing village.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

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

This sprawling woodland estate was the brainchild of iconic American industrial designer Russel Wright.

The quarry was abandoned over 100 years ago, after a massive ammunition explosion ended in tragedy.

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

One of the earliest bowling lanes in the U.S. doubled as a sewing school during a time when women had little job opportunity.

Revolutionary War casualties fill the only 17th century structure remaining in Manhattan.

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

Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.

An abandoned tuberculosis hospital moulders on into an uncertain future.

This abandoned ironworks was once the most important military supplier in America.

The rustic think-space of famed naturalist John Burroughs stands exactly as he left it.

A mysterious, abandoned building rotting on the Brooklyn waterfront.