When an ancient supervolcano erupted, some of Nebraska's prehistoric animals were forever preserved in ash.

This large midwestern cavern features impressive rock formations and an underground waterfall.

Most comprehensive museum in America devoted to one ethnic group.

One of the world's most definitive collections of musical instruments, spanning all cultures and historical periods.

A massive bur oak tree believed to be some 500 years old is the centerpiece of this quiet urban greenspace.

Spanking machines, fake goats, and more devices of humiliation are on display in this museum of fraternal initiation devices.

The hometown of Popeye's creator is littered with a growing collection of granite cartoon characters.

A subterranean haunt where wine and homemade biscottis are always on the menu.

The collection is housed in an exquisite mansion that makes you feel like you've been transported to an Italian villa.

Giant granite rocks standing end-to-end like a train of circus elephants.

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

Giant works of art interspersed throughout meadows and woodlands offer a new discovery at every turn.

Nature's biggest mammal swims in landlocked Oklahoma.

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

Who said a biker bar is no place for a taxidermy squirrel collection?

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

This century-old roadside attraction is full of bizarre rock formations.

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

Home to Hollywood history and a very special salt crystal.

Curious rock formations in a tiny Kansas state park.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.

A landscape of massive spherical boulders are the main attraction in this Kansas State Park.