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

This giant disembodied horse head seems to balance impossibly on its nose.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

Mysterious rocks that ring musically when struck.

This jail which was in service for over a century is now open for curious visitors.

Intricate storybook scenes are tucked inside these shadow boxes, which are tucked inside a library in the Pocono Mountains.

The final resting place of the Hollywood star who came to a tragic end.

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

Historic town settled in the 19th century because of its convenient location along a popular coal transport route.

This ominously named New Jersey street seems to be attracting over-the-top legends of its own making.

Local lore claims this park is named after a young woman who jumped off a cliff.

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

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

Six peaceful acres in a residential neighborhood dedicated to art and peace.

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

Underground tunnels remain beneath this abandoned mental asylum.

Want to build a wind turbine? Secede from the nation.

How did the right arm of a 13th-century English bishop wind up in a Connecticut church?

This small-town pizzeria won the Hollywood lottery.

The kind of mixed-up place that drives archaeologists crazy.

New London, Connecticut still holds a grudge against its hometown son who turned traitor and burned the city.

The world's largest indoor go-kart racetrack is hiding in Connecticut.

With some 500,000 books across five buildings, this bookstore is a reader's paradise.

One of America's first spies started out as a teacher in this little red one-room schoolhouse.