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

Dramatic river bend surrounds a natural red-rocked pedestal.

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

Rippling sand dunes frozen in the Arizona rock.

A B&B on a Victorian lighthouse station in San Francisco Bay.

Cows on a ranch are commonplace, scattered cow bones everywhere? Not so much.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

The haunting ruins of Jack London's dream house.

This mountaintop beacon is only lit three times a year but shines like some kind of all-seeing eye.

Wheels of chrome by the thousands adorn this California Historical Landmark.

Dentist's hated concrete colossi are now beloved icons of the community.

This former boomtown "island" is now submerged below Folsom Lake.

If you dial the number in this abandoned office window "Sam Spade’s" secretary will ask you to leave a message.

This 19th century hydroelectric powerhouse was the first of its kind.

This museum boasts the ninth-largest collection of insects in North America.

Seven ceramic sculptures are scattered around this California college campus.

Each summer, the migratory bats living beneath the bypass form "batnadoes" at dusk.

Ten 25-foot-tall, beehive-shaped kilns, abandoned in Death Valley.

The abandoned train depot now doubles as a well-placed rest stop for those who take the road less traveled.

An abandoned boat that's been stranded mysteriously for decades.

This little gem of Spanish Colonial architecture has been abandoned since the 1950s.

The remains of a deserted steamboat sit rusting beside an old ferry pier and an abandoned train platform.

An abandoned car and strange wooden debris are among the scattered remains of the old sand and gravel quarry.

A lawless town deep in Death Valley was famous for its riches and death rate.