This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

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

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

This picturesque stream was up until recently the site of a ten story mountain of slag and sewage.

The ruined remains of a coal mining ghost town are hidden within the woods.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

A retired firefighter created this contraption so he and his family wouldn't die if accidentally buried alive.

A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

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

A rock maze opens up to a panoramic viewpoint at an abandoned mine full of ghost stories.

This restaurant offers a side of antiques, curios, and a bathroom chock full of owls.

A tiny, unmarked beer and whiskey bar above an Ethiopian restaurant in West Philly fails to conceal live bluegrass.

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

Steepest flood safety railway in the entire world.

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

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

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

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 home and studio of a visionary woodworker now stands as a museum and example of his artistic genius.