Catch a ride through the Pennsylvania countryside on this historic narrow-gauge railroad.

Hidden in the hills of Western Pennsylvania lies one of the best-kept ghost towns in America that you can legally visit.

The slate extracted from these Pennsylvania quarries was once hailed as the finest in the world.

An industrial waste tourist attraction.

These hooded graves are the only of their kind in the United States.

The site of America's first commercial oil well essentially disappeared after the town went bust.

A "house to which to flee" for settlers in colonial Pennsylvania.

Overshadowed by quilts, the artistry of these patterned textiles went underappreciated for too long.

Where the famed frontiersman was born, raised, and survived Quaker intrigue

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

An abandoned railroad tunnel transformed into a creepy path for hikers and cyclists.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

Where the oil industry began.

A museum and research center dedicated to preserving the history of Rolls-Royce and Bentley motorcars.

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

Pittsburgh's literal underground railroad.

Once the most painted on object in the world, this short campus fence is well on its way to being so again.

A living maritime paradox still floats in the same lake where it was built and resurrected... or was it?

America's smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

A small museum along the Susquehanna River is home to a rich collection of Native American artifacts.

This dramatic rail curve was once the target of a failed Nazi attack.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

A unique workspace where offices reside on pirate ships and inside gingerbread houses.

Steepest flood safety railway in the entire world.