Eons ago, a rushing lava river formed this pristine passage through solid rock.

Ancient pueblos built into the base of a natural canyon wall.

A spiritual vortex among the red rocks in Sedona.

These free-roaming horses were once destined to disappear from the land.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

This abandoned horse racing track was an exercise in hubris from its inception.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

Concrete crosses scattered across the Arizona scrubland which were used to align spy satellites.

This working class sculpture pounds his hammer all the livelong day.

A Saint Nicholas-themed ghost town in the Mojave desert.

Jail from the 19th century that was built by inmates.

These black pillars of volcanic basalt seem to call mountain climbers with an unbreakable siren song.

A small section of Boise, Idaho maintains the unique culture and traditions of the Basque people.

Boise State's stadium was the first non-green football field in the world.

All of the 20 occupied houses in this mostly abandoned town feature some curious display of junk art.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

Opinions differ as to whether this Arizona tree was actually used as a Wild West jail, but that hasn't stopped the town from capitalizing on it.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

This historic tower in the California desert promises visitors a "vortex of good vibes".

Limestone caves with spectacular showcase chambers.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.