The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.

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

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

A cabinet of curious mathematical models and old calculators.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

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

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

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.

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

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

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

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

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

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

A spiritual vortex among the red rocks in Sedona.

Limestone caves with spectacular showcase chambers.

The world's largest military aircraft cemetery.

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

Miniature art that tells an enormous story.

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.

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.