This reclusive Hopi village in Arizona has been continuously populated longer than anywhere else in America.

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

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

This southwestern historic site was designed and built by an artist who wanted his work to "feel at home."

Don't blink or you'll miss it.

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

An artificial crater field that trained astronauts for lunar exploration.

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

Limestone caves with spectacular showcase chambers.

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

A motel dedicated to Southwestern nostalgia.

The Magical World of George Phar Legler.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

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

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

One of the largest, oldest, darkest, quietest motel rooms in the world.

A stealthy Apache hideaway that became the haunting site of a mass grave.

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

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

Outsider Art Community.

A reproduction of earth's many biomes.

A self-built castle made by a mysterious man.

An homage to everyone's favorite prehistoric cartoon family.

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