"Polynesia on the Plains."

A Hawaiian stairway to heaven—that you can't climb.

The unusual burial monument of Arizona's first governor.

A working cattle ranch with remarkably well-preserved prehistoric petroglyphs and ancient ruins.

This sanguine boulevard was named after a deadly cowboy bar fight.

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

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

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Most-visited and most-photographed slot canyon in the American Southwest.

Rippling sand dunes frozen in the Arizona rock.

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

Frank Lloyd Wright died a year before construction on his largest public project even began.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

This fantastical house shaped like a seashell brings aquatic design to architecture.

An Aztec snake god has taken the material form of an apartment complex.

This ultra-modern home clings to the slope of the Hollywood Hills on a precarious stilt.

A spiritual vortex among the red rocks in Sedona.

An architectural statement of artistic intent smack in the middle of Providence, Rhode Island's Colonial uniformity.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

An urban laboratory.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.