Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

A museum befitting the city responsible for supplying the majority of the world's LSD.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

A large instrument played by the wind.

The longest burning light bulb in the world.

A strange house built only at night, with rumored mystic inspiration.

At this California chicken ranch, four bucks will get you 18 eggs and a chorus of dancing animatronic poultry.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

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

A hidden world of exotic succulents and cacti.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

This odd California folly seems like it was almost designed to accumulate urban legends.

San Francisco Bay's ghost town.

An ominous concrete cube cuts a dystopian silhouette atop this California mountain.

A giant can of fruit cocktail is all that remains of what was once the world's largest cannery.

A statue commemorate Tommie Smith and John Carlos's brave protest at the 1968 Olympics, a watershed moment for civil rights.

Guarded by the Angel of Grief, the Stanford family tomb attracts an odd mix of halloween revelry and somber contemplation.