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

Maryland's first (and last standing) toll house on America's first federal road established the state as the "Gateway to the West."

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

A larger-than-life statue of America's favorite sundae marks the place it was invented.

The antique hotel still has a jail in the basement, though the cockfighting ring is long gone.

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

This museum is dedicated to the first coast-to-coast highway.

Pennsylvania's own Roswell-style UFO mystery.

Memorializing an American tragedy of massive proportions.

Steepest flood safety railway in the entire world.

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

This public park was the site of the largest civilian disaster of the Civil War.

The last street in Pittsburgh that's paved with wood.

This California artist's front yard acts as a gallery for his unique, scrap metal animal sculptures.

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

This tiny museum kept in a B&B laundry room holds the death mask of notorious bank robber Pretty Boy Floyd.

"Where the ducks walk on fish."

Rows of 19th-century brick ovens used to process coal into coke form the center of a wooded park.

10,500 square feet of pinball housed in former dollar store and home to the last playable "Thunderball."

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

Antiques and recycled art surround this cabin designed to resemble a 19th-century schoolhouse.

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

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

Despite being stolen multiple times, this civic electrician's street corner Snoopy won't be stopped.