An abandoned, unfinished mansion on grounds strewn with lava rocks.

Condemned US Navy seaplane control tower turned officers’ club sits atop Yerba Buena Island.

A man-made island in scenic San Francisco Bay.

An enormous artwork that colorfully celebrates over 150 years of US military achievements.

A decommissioned Naval base now rents itself out for people who want to blow stuff up.

One time home to turn of the century explosives, now hidden under the Bay Bridge.

Once the gateway to the utopian dream-village of a Civil War embalmer.

This infamous prison has a store where you can buy goods crafted by incarcerated people.

Where the alchemists dream of transmuting base metal into gold was actually achieved.

Puzzling...this tree looks like an assemblage of dismembered monkey limbs.

The haunting ruins of Jack London's dream house.

Special tunnels built so that frogs won't be killed when crossing the highway.

Outsider art or homage to aliens?

Seven ceramic sculptures are scattered around this California college campus.

This graffiti-covered bridge is the quintessential vision of a place for disillusioned youth to escape the complexities of burgeoning adulthood.

This corn maze so big you may want to pack a lunch, and possibly a flaregun.

Over 300 taxidermied animals in a Californian restaurant make for a taxidermist's dream and an animal lover's nightmare.

The largest drain hole in the world.

The former Naval shipyard is open for exploring - mostly.

Junkbots and mud babies are the masterpieces in this fantastically sci-fi art museum.

The oldest Naval cemetery on the West Coast.

Where the polar bear watches over everything, and every drink is a double.

A historic hotel in an old California railroad town with a rowdy reputation.

The timepiece that exonerated a labor radical accused of a parade bombing that killed ten people.