Believed to be the birthplace of the United States Marine Corps.

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

Don't get it twisted: This is the oldest pretzel bakery in the United States.

An occult-y, historic hotel with the World's Largest Ouija board on the roof.

Could it have picked a better place to land?

A miniature golf course crafted inside the world's largest simulated cave.

Step into a pastel time capsule where candy is truly dandy.

Journey through a collection of over 35,000 Halloween items from all generations.

An outlandish shoe shaped house built by an eccentric millionaire.

A historic covered bridge is but one example of an oddly prevalent American urban legend.

This semi-spooky remnant of an abandoned hotel provides fantastic views.

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

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.

The abandoned coal loading dock is a canvas for unsanctioned art.

The graffitied ruins stand hidden within the Pennsylvania woods.

This might just be the TARDIS of bookstores.

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

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

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

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

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

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