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

A beautiful geyser under environmental threat.

An architect's childhood fantasy treehouse made real.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

Population: 1.

This Wyoming town is fascinated by a particular mythical creature.

A small town built on an abandoned airfield has former runways as streets and a bar and grill in an old airplane hangar.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

A popular rock that acted as a waymarker for American pioneers.

A devilishly named gorge that was a sign of salvation for many pioneers.

This prison-turned-museum is a remnant of the Old West's grizzly, violent past.

Surrounded by a hundred mile radius of billboards, Little America is a roadside attraction whose primary appeal is hospitality.

This UFO landing strip was created by a charitable Wyoming city that was worried about residents of Jupiter.

One of the largest collections of wildlife art in the United States, built into the side of a cliff in rural Wyoming.

At the time of its completion, it was the tallest dam in the world.

The first declared National Monument in the United States.

Native Americans built this circle of stones, which was used to predict astronomical events.

Yes, this monument is aware that it is about 20 miles away from the actual center of the United States.

Every president in history is immortalized in bronze in downtown Rapid City.

An entire city block built completely out of petrified wood.

This Wild West attraction is alive with glitching automatons.

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

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