The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

On this Polish road, an optical illusion makes cars seem to roll uphill.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A piece of John the Baptist in the American heartland.

This abandoned prison castle has become an imposing gallery of graffiti art.

One believer transformed a local curiosity into proof of Vikings on the Great Plains.

The future of roadside attractions is this sci-fi soda mecca that is home to a 66-foot tall neon pop bottle.

This abandoned, windowless concrete block is one of the strangest buildings in Tulsa.

A four-hour holy-rolling, Hallelujah-shouting, Southern gospel service, rendered as a country market where "All Is Welcome, Jews, and Gentiles."

Orr Park's dead trees have been carved into a menagerie of whimsical visages.

A former taxidermist has turned his old shop into a folk art mecca.

One person’s lost luggage is another person’s treasure.

You'll need cowboy boots to trek to this old-fashioned saloon nestled in a giant natural cave.

Grand opera on a miniature scale.

This massive railroad spike celebrates the 1939 premiere of the movie “Union Pacific.”

The notorious couple camped at this site after a bloody shootout with police.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

This unassuming city park is home to three different types of Native American mounds.

Remnants of a quarry company town still stand on the banks of the Wapsipinicon River.

An eclectic assortment of medieval architecture in a small Iowa town.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

Home to a protest movement, a bombing, and a dramatic change in labor history.

Chicago’s incendiary role in the labor movement.