San Francisco's first World's Fair, dedicated to the wonders of California.

These subterranean storage areas hold emergency water reserves.

A shining, cold, black organ lies in San Francisco's financial district.

A monumental cross hides in the trees in Golden Gate Park.

A 1920s home transformed into an immersive art experience, where every room is a portal to another realm.

The sole surviving relic of the San Francisco neighborhood cobbled together from old horsecars and streetcars.

This antique shop specializes in the history of print and design.

This giant head is all that remains of a once proud statue that survived an earthquake but not a fall off of a wagon.

The rustic cabin-like decor of this Arts and Crafts-style church reflects the love of nature central to its little-known theology.

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

The oldest dim sum restaurant in the United States is a nostalgic jewel.

Reverend Franzo Wayne King administers spiritual enlightenment through the music of the jazz legend.

America's oldest Italian restaurant is a San Francisco institution.

The first AIDS memorial chapel in San Francisco and one of only a few in the U.S.

Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

The only visible piece of San Francisco's most famous shipwreck.

An art supply shop holds the secrets of this quiet neighborhood's raucous Barbary Coast past.

Appropriation-friendly collection of books, periodicals, and more.

One of few lasting examples of the brief octagon craze that developed into folly.

Alleyway plaque commemorating the death of a fictional character in The Maltese Falcon, not far from the author's home.

Radioactivity still cause for concern at this urban explorer's paradise.

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

Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

Gold Rush ship-turned-hotel buried underneath San Francisco's financial district.