One of the first commercially successful anthracite-powered iron-making operations in North America.

This demolished goliath of American industry once loomed over the depressed town it once made thrive.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

A converted hangar displays dozens of helicopters, from a famous 1943 rescue chopper to several autogyros.

A well-preserved example of an early industrial operation in the northeastern United States.

A piece of crumbling highway infrastructure was repurposed as a high-tech facility for testing racecars.

This museum is dedicated to the first coast-to-coast highway.

This Art Deco service station has been providing tune-ups and turning heads for close to a century.

Beautiful views of the surrounding hills and birds of prey can be found at this sanctuary.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

Memorializing an American tragedy of massive proportions.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

Steepest flood safety railway in the entire world.

A daily replay of the experiment that proved the rotation of the Earth.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

It would take 35 firetrucks to fill this enormous glacial pothole.

This titanic java kettle is one of the many kitschy landmarks located along America's OTHER famous highway.

This semi-spooky remnant of an abandoned hotel provides fantastic views.

There aren't too many operational funiculars around, but Pittsburgh has two!

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

The graffitied ruins stand hidden within the Pennsylvania woods.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.