The first marker along the famous boundary.

Long before the Battle of Gettysburg occurred, dinosaurs roamed the area and left their footprints on this bridge.

Metal monsters made from repurposed materials lurk alongside this Pennsylvania road.

The meeting of the northwestern corner of Delaware, the northeastern corner of Maryland, and the southern edge of Pennsylvania.

These unique rock formations were created during the Ice Age.

Where the famed frontiersman was born, raised, and survived Quaker intrigue

A diorama of the Civil War, fought by cats.

This roadside stand packs 300-plus varieties of tomatoes, from "Maiden's Fire" to "Kaleidoscopic Jewel."

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

A museum dedicated to the history & joys of the trail & your best chance to see hikers throwing up ice cream.

It may appear to be a fancy junk yard, but each item has a story to tell and a lesson to impart.

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

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

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

An 18th-century Catholic church converted into an eccentric temple of music and bacchanalia.

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

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

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

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.

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

A toxic ghost town sitting atop a massive coal fire.

Yo, Adrian!

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