If you are looking for a used Russian battery, Chinese Ham Radio or other electronic oddities this Flea Market is a good place to start.

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

Subterranean house made out of a grain silo, located in the Santa Cruz Mountains.

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

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

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

An artsy hidden staircase leads to breathtaking views of San Francisco.

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

Abortion, prohibition, religion, war, and fear all play a part in the history of this idiosyncratic Pacifica castle.