Construction uncovered this trove of fossils, which visitors are welcome to add to their own collections.

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

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

Narrow gorges and deep pools created by long-ago glaciers.

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

Long hidden under grime, the politically radical murals of a little known Yugoslavian master are finally getting their due.

The pop art icon's gravesite is broadcast 24 hours a day on his museum's website.

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

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

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

This eccentric mansion museum holds a impressive collection of rare and automatic instruments.

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

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

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

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

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

A soon-to-be-forgotten roadside spectacle loaded with local lore.

"Where the ducks walk on fish."

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

A field of nothing but boulders which resembles a giant's gravel driveway.

Priceless space junk on display in front of a local Dairy Queen.

A beautiful oddities shop crammed with strange and morbid curiosities.

In the early 1800s, surgery was also a show.

The first American department store, and home to the largest operating musical instrument in the world.