A kitschy, creepy St. Louis mainstay.

A big museum full of little worlds.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

The world's largest collection of fine-scale miniatures and one the nation's largest collections of antique toys.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

European castle ruins in an American state park are actually the product of death and grief.

The former broadcast site has been reimagined as a museum about the medium.

Known locally as "the giant head," this 14-foot LED sculpture has a photo booth in the neck where you can have a 3D picture taken and displayed.

A fiberglass jungle, deep in the wilds of the Cleveland suburbs.

Learn about the history and craftsmanship of carousels inside this museum located in a former post office.

The permanent home of Elektro, the celebrity automaton of the 1939 World's Fair.

Acres of English cottage gardens, unexpectedly nestled in a Cleveland suburb.

A record-size collection of wild-haired troll dolls tells the story of the mythical creature's roots in Scandinavian folklore.

This burger joint is named after everyone's favorite carnival prize and is adorned with a giant one over the door.

Unique collection containing a wide and curious range of contraceptive items.

There are more than 4 million bricks inside this unofficial Lego museum in a former middle school.

A retro walk through the history of the tube.

A miniature world of concrete and stone in Springfield, Ohio.

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.