The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Believe it or not, this is the final resting place of the man who created the Odditorium.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A porcelain company's former dumping ground, completely covered in pieces of collectible ceramics.

An abandoned Cold War missile radar site.

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

A B&B on a Victorian lighthouse station in San Francisco Bay.

Come for the records, stay for the retro pinball machines.

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

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

Of all the origin stories for weed's secret code, this one likely has the goods.

The largest drain hole in the world.

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.

Massive prehistoric mammals used these stones as oversized scratching posts.

A poignant memorial to a young boy whose death spurred a dramatic increase in organ donations in Italy—dubbed the "Nicholas Effect."

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

The largest Star Wars collection in the world is its own galaxy of collectibles.

This collection of hand fans doubles as a history of femininity.

California's own majestic geyser is powered by a subterranean volcano.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

This historic California cemetery holds the bodies of veterans of both the Civil War and the Donner Party.

A tribute to one man's legacy of improving the accordion's reputation.

The fossilized remains of ancient California redwoods.