Steepest flood safety railway in the entire world.

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

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

These disused steel furnaces are now haunting ruins that may one day be a national park.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

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

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

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

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

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 mine fire has been burning under the deserted town since 1962, but this church is still going strong.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

An abandoned stretch of highway, deteriorating next to the operational one.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

A toxic ghost town sitting atop a massive coal fire.