The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

This geodesic gallery holds a collection of painted spheres that make traditional canvases look lazy by comparison.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

A fitting attraction for the corn capital of the world.

A museum dedicated to the history and art of staying clean.

This museum glorifies the humble potato.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

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

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.

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

Home to Hollywood history and a very special salt crystal.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

A miraculous natural phenomenon known as "the spring that breathes."

An architect's childhood fantasy treehouse made real.

One man's ambition created this psychedelic log home.

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.