Towering basalt columns, a creation of fire and ice.

Singing sand that stands as the final remains of an ancient lake.

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

Collection of vintage trailers double as hotel rooms.

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

The biggest solar telescope in the world helps reveal the secrets of our sun.

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

The world's largest military aircraft cemetery.

A natural history wunderkammer in the middle of the desert.

An Arizona museum with a collection of pharmaceutical oddities, including a jar of a gangster's chewed gum.

Giant telescope mirrors built in a spinning furnace under a college football stadium.

This collection of neon icons is preserving Arizona's history, one sign at a time.

One of the world's largest telescopes, stares into the night sky with two huge mirrors.

An urban laboratory.

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

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

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

A reproduction of earth's many biomes.

When life gave this firefighter a forest fire, he made a rough-hewn sculpture park using a chainsaw.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

Once the site of speeding horses, now home to picnickers and public concerts.

Deco Modern sculptures of the people of the Pacific, cast for the 1939 Golden Gate International Exposition.

The grand, column-fronted, sculpture-adorned home of the ambitious digital library.

Nuclear waste dump site now an environmental sanctuary.