Generations of rockhounds got their start at this beloved, historic mine.

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

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

This abandoned sea fort has become an accidental bird sanctuary.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

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

According to local lore, this narrow passageway through two large rocks was accidentally created by the devil himself.

One man's real life disfigurement inspired a lasting local legend surrounding an eerie tunnel.

An eccentric priest's tribute to George Washington, this chapel tells the story of the American Revolution.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

One of Philadelphia's largest murals resides hidden under this bridge.

An abandoned, rusty old relic of railroad history stands at attention over the Cuyahoga River.

Where America's first doomsday cult awaited the end of the world.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

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

Serving Central Asian breads that range from cracker-crisp to warm and fluffy, this bakery brings Bukhara to Queens.

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

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

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

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

An eerie, decaying ghost town destined to fade into the forest.