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

Steepest flood safety railway in the entire world.

Memorializing an American tragedy of massive proportions.

No one knows who painted this mysterious mural in a Penn State basement.

This 19th century machine put animals (including humans) in boxes to study how they metabolized calories.

Penn State's giant bug collection.

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

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

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

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

10,500 square feet of pinball housed in former dollar store and home to the last playable "Thunderball."

The Pennsylvania shopping center was once the setting for the 1978 film, "Dawn of the Dead."

An ode to filmmaker George A. Romero, who used the mall to film an iconic horror movie.

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

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

One Pittsburgh musician's decades-in-the-making memorabilia collection is on display at this rock-n-roll curio shop.

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

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

The god of wine stares out at passersby on this busy Pittsburgh thoroughfare.

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

This permanent exhibition celebrates the finest of our heartless automatons both real and fictional.

This historic Pittsburgh tennis complex is a rare example of natural red clay courts.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.