A Route 66 filling station that was designed to resemble the Hagia Sophia, and is now the symbol of an arts district.

This beacon for pre-radar pilots once guided Charles Lindbergh to a safe touchdown in Tulsa.

Collection maintained by the legendary designer.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

Destroyed by flood waters, prison now serves as a training ground for armed forces.

The only fully-realized skyscraper built by the famed American architect, Frank Lloyd Wright.

A collection of beautiful crystals shaped like freshly plucked roses.

What was once a summer home next to a waterfall has now become littered with graffiti and children in swimsuits.

A school-themed restaurant where gastronomy is the core curriculum.

"Dallas’s pretty much only carnivorous plant gallery."

Cockroach Museum features roach celebrities and live hissing cockroaches.

No matter what the plaque under this massive legume says, this is not the world's largest peanut.

A small wooden boat once owned by legendary actor Errol Flynn sits inside this Oklahoma gas station.

The deepest spring in Missouri.

Often referred to as the largest spring in America.

An underground river pushes more than 200 million gallons out of this Missouri spring every day.

A hillbilly theme park that proved so unpopular the land wouldn't even sell on eBay after it closed.

These waterfalls can be twins or triplets, depending on how much it's rained recently.

The highest waterfall between the Rockies and the Appalachian Mountains.

This mill has survived a tumultuous past to still produce flour and cornmeal.

Three markers installed over the course of 140 years mark the point where Arkansas, Missouri, and Oklahoma converge.

When he found his hometown was no more, Lowell Davis decided to recreate a "new" ghost town from scratch.

A 35-foot-tall fork stuck in the ground outside an office building in Missouri.

Once the smallest park in the national system.