A Roman-inspired temple once controlled half of San Francisco's waters.

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

Elephant seals and sea lions have turned the abandoned buildings on this island into their endangered love shack.

International delicatessen has been owned and operated by the same family for more than 110 years.

The blinking light atop the iconic landmark has been sending secret messages for decades.

This large collection of tiny things revels in the art of fine machinery well made.

It's not your typical library, memorial, or book store.

A monthly street "service" of handmade puppets and live original puppets, whose devotees profess has the power to change lives.

The longest burning light bulb in the world.

North America's largest accredited model railroad museum.

Haunting and beautiful trees, doomed to die.

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

Recovered from the brink of extinction, at home in the Financial District.

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

A grove of "candelabra redwoods" deep in California's Lost Coast.

Antiques by the Bay.

A creepy steel gremlin has protected the Bay Bridge since 1989.

An vast warehouse of everyday treasures in Berkeley, CA.

A small sculpture garden that provides a microcosmic representation of California.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

An academy where anyone can train in the exciting acrobatic sports of parkour and freerunning.

The dramatic upward-curving roof is one of the most iconic examples of Googie architecture that still stands today.

A brooding mansion of clinker brick stands out among the Victorian houses of Pacific Heights.

An abandoned Cold War missile radar site.