An abandoned asylum incorporated into a college campus.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

The largest earthwork effigy in the world.

This claimant to the title of "smallest church in the 48 states" doubles as an equally tiny, quasi-post office.

A monument marks the location of the first successful steamboat demonstration.

The highest point in Maryland is only accessible by hiking through another state.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Berkeley Hot Springs presents to you "the only outdoor monument to presidential bathing."

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.

This red-eyed chrome beast pays homage to the popular modern myth of West Virginia's insectoid monster.

The site of America's first commercial oil well essentially disappeared after the town went bust.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

This dramatic rail curve was once the target of a failed Nazi attack.

An almost life-sized elephant named Ms. Ellie greets visitors at this jumbo-themed museum.

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

A local prank turned town icon.

This elaborate towering structure was once famed for its revolutionary height.

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

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

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

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

An abandoned stretch of highway, deteriorating next to the operational one.

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

A diorama of the Civil War, fought by cats.