This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A museum dedicated to the alleged Roswell Incident.

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

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

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

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.

Less a museum than a bizarre fantasy world created by artists and engineers.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

A small storefront museum explores the history and myth of West Virginia's famous urban legend.

This research center for rare prosimians is studying how they sleep to help prolong human life.

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

Enormous lake at the bottom of a unique cave system.

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

A castle built by an eccentric medieval enthusiast in rural Ohio.

A 70,000-square-foot institution dedicated to a very literal, creationist perspective on the Book of Genesis.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

A place to eat for on-the-run agents and espionage enthusiasts.

A bypass decorated with large wooden troll carvings.

Covered in tens of thousands of coats of paint, this Indiana attraction holds a world record all its own.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

A fitting attraction for the corn capital of the world.