Hundreds of drawings left by the land's previous inhabitants remain mysterious.

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

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

This little-used trail winds through the highest mountain range in central Nevada with sections around 10,000 feet.

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.

Bug-devouring flora are the stars of a special wing of the glass conservatory.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

These petroglyphs created by ancient Arizonians have withstood centuries of exposure to the elements.

The highest point in Nevada had to be decided by court order after California tried to claim it as their own.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

A hard-to-reach oasis in a desolate corner of Death Valley National Park.

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

The stone circle honors the 19 firemen who perished during the Yarnell Hill Fire.

The rocks in this arid basin leave trails of movement behind them.

Travelers leave tea kettles in a remote part of Death Valley as part of a mysterious, decades-old tradition.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

In one of the hottest parts of the Mojave Desert, shallow bedrock forces the typically dry Mojave River to the surface in this canyon, providing a vital oasis for humans and wildlife.

Water of undetermined depth has attracted rare fish and cult leaders alike.

A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.

Two geoglyphs that are truly unique to North America.

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

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

One of the most extensive and well-preserved collections of dinosaur footprints in North America.

Irontown was founded in 1868, as a second attempt to mine iron from the nearby Iron Mountain.