Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

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

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 clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

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.

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

This might just be the TARDIS of bookstores.

Delicate Wurlitzers, creepy clowns, and The Noid all share space in this insane explosion of kitsch history.

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

A park full of outsider art, created by college students studying outsider art.

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

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

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

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

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

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

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

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

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

World's first "penitentiary," meant to be humane, drove men insane.

A men’s restroom became a sandwich shop.