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.

A museum and research center dedicated to preserving the history of Rolls-Royce and Bentley motorcars.

Penn State's giant bug collection.

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

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

A quirky collection of outsider art made from automobile parts.

This icon of the Atomic Age now lays dormant.

These lush botanical gardens employ the most purrfect pest control force.

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

Behold the rickety wooden glory of the world's oldest operating roller coaster.

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

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

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

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

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

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

A failed piece of Orientalism has become the proud symbol of a community.

A macabre farm reserved part of its 222-acres for dead bodies, all in the name of science.

This public space is speckled with the eerie remnants of a defunct amusement park.

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

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.