These four islands right offshore have waterfalls, colorful lights, fancy buildings, and a secret purpose.

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

This pseudo-steampunk weapons facility is the world's largest wood and glue structure, and packs quite a wallop.

A sudden forest of traditional Papua New Guinean art works is hidden in a corner of Stanford University.

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

A hidden world of exotic succulents and cacti.

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

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

The most beautiful Taco Bell in the world even has surfboard parking.

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

A 1920s speakeasy that had rum runners racing up and down the shores of California.

An eatery within a Bay Area Buddhist temple pulls off all your favorite Vietnamese classics without the meat.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The garage at the childhood home of Steve Jobs was a hangout for the founders of Apple, even if they never built computers there.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

From the Difference Engine to the Cray-1, all under one roof.

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.

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

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Housed in a memorial lighthouse, this museum relays the history of surfing, beginning with the antics of royal Hawaiian teenagers.

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

Oldest building in California still in use.

This dark, quiet forest on the outskirts of San Diego is dense with rumor and lore.

The overgrown ruins of a once thriving World War I-era copper mine.