Where the oil industry began.

Memorializing an American tragedy of massive proportions.

Dozens upon dozens of boulders engraved with scripture tell the story of one man's troubled life.

"Where the ducks walk on fish."

For decades, it has disappeared and reappeared as water levels rise and fall.

Could it have picked a better place to land?

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

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

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

Pennsylvania's own Roswell-style UFO mystery.

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

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

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

Yo, Adrian!

In which a local geological marvel becomes a quaint roadside attraction.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

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

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

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

Tucked into Pittsburgh’s North Side, the Mattress Factory is a labyrinth of permanent, room-sized installations where artists transform entire spaces into mind-bending, immersive worlds.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

This secluded walking trail is a hidden gem of a Pittsburgh park.