Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

This print shop boasts one of the largest pinball arcades in San Francisco.

Where the line between entertainment and aerospace blurs.

Half of a house.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

Sunset-colored dunes of volcanic ash make taking a poor photo impossible.

Located on 420 acres in the high desert, this spiritual center is dedicated to the "science of the future."

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

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

These millipedes glow not out of attraction, but as a not-too-subtle warning.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

The abandoned personal amusement park of the King of Pop.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

San Francisco Bay's ghost town.

One of the ghostly stops along Route 66.

No matter what it might seem like on film, most scenes filmed on a plane are filmed at this LA studio.

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

One of the last free public hot springs is decorated with hippie art.

The ghost town that ended up on Ebay.

A multimedia experience that chronicles the atrocities of racism.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

The largest drain hole in the world.