This California tree is the single source of the state's entire orange industry.

The Citrus Variety Collection at UC Riverside contains two trees of each of the 1,000+ varieties of citrus.

This Pringle-shaped ledge makes for the perfect photo op.

The victims of a free-floating Japanese bombing during WWII are remembered by this stone monument.

Mine your own precious stones.

A spectacular but little-known slot canyon in extreme northern Nevada, with sheer walls nearly 500 feet high and a perennial stream.

This giant slab of driftwood marks the beginning of the Winnemucca to the Sea Highway.

A hidden gem of a saloon in the middle of a ghost town.

One of the most remote spots in America and the first protected wilderness area in Nevada, named after an old legend.

The world's largest dead polar bear, immortalized by taxidermy and Hunter S. Thompson.

Drive up a paved road into "Nevada's Yosemite" for exquisite views and mountain hiking in an alpine setting.

If it wasn’t for an innovative use of quilts during a crisis, the city of Panguitch might not exist today.

Rippling sand dunes frozen in the Arizona rock.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

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

A series of labyrinths in the Nevada desert inspire meditation and calmness.

Two geoglyphs that are truly unique to North America.

The precious-metals strikes dating back to the 1860s are now mostly inactive, but this area has become the United States' only domestic source of lithium.

Michael Heizer's masterwork in the Nevada Basin.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

These temples are among the oldest free-standing stone buildings in the world.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

This 50-foot-deep sinkhole created in the 14th century is home to rare plants and fungi.

This subterranean necropolis holds three floors of antler-dug grave caves.