Some of the tallest ancient American ruins continue to inspire awe and curiosity.

Limestone caves with spectacular showcase chambers.

America's only nuclear missile silo open to the public.

A reproduction of earth's many biomes.

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

A geological mystery on Camelback Mountain.

Yo, Adrian!

Dr Barnes' $25 billion private collection of art and arboretum.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The world’s first penitentiary, meant to be humane, drove men insane.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

2300-year-old Roman road connecting the empire.

An ancient neolithic tomb that only sees the sun twice a year.

The timeworn "Yankee Stadium" of the fastest game in the world isn't going anywhere.

This conservation area is also home to many of the region's desert tortoises.

An old California photo stand has been turned into a shrine to the cozy art of crochet.

Located on 420 acres in the high desert, this spiritual center is dedicated to the "science of the future."

You don't have to be a diplomat to visit the so-called Camp David of the West.

A giant desert bird that once swung music fans at Coachella now has a home in a nearby traffic circle.

Traversing these canyons, visitors can take in stunning views and glimpses of the region's history.

Instead of faces, these sculptures have barcodes—statements on societal dehumanization.

Explore the wide world of desert plants at this unique Palm Springs botanical garden.

A giant knight, sex education, date shakes, and Jesus coexist happily in this Coachella Valley desert oasis.