Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

A store that sells all manner of bones, insects, and animal curiosities.

Where a staggering 747 ships were constructed during World War II.

9,000 square feet of vintage and modern mechanical toys, dioramas & sideshow curiosities.

The remains of this early 20th century refinery loom on a mountainside like a graffiti-covered fortress.

An abandoned cyanide mill is now a haunting magnet for graffiti and illegal parties.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

An abandoned lot littered with concrete debris was once the home of the world's first female railroad president.

This abandoned motel doesn't welcome guests anymore, but decay and a creepy atmosphere still call it home.

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

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

The ruins of the castle that chemicals built.

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

A crumbling wizard is one of the final reminders of a roadside Middle Earth.

Spiral labyrinth hidden in the hills above Oakland, CA.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

The only theatre in the world constructed specifically for sound movement.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

A huge musical instrument played by the ocean.

Location of the most powerful laser in the world, and the potential birthplace of tiny stars.

A shape-shifting buy-sell-trade bookstore, born to Beatnik Era spirit.

Playable, historic pinball machines fill this Alameda museum.