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

This print shop boasts one of the largest pinball arcades in San Francisco.

Art in the form of a winding, man made crack in stone.

A miniature view of the park, caught in time.

Guns that have been defending San Francisco since 1904.

The taxidermied remains of the "last wild grizzly bear in California" and of the symbol of the state of California.

An enormous illuminated figure dances on the Las Vegas strip.

Faceless white figures loom over the city from the rooftop.

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

This 19th-century church is now a popular roller rink.

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

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

Early prototype for Frank Lloyd Wright's Guggenheim.

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

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

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

Over 315,000 preserved amphibians and reptiles in jars.

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

The grand, column-fronted, sculpture-adorned home of the ambitious digital library.

Art from the latest counter-culture; kids who dye their hair blue and believe the future will be a post-apocalyptic water world.

Longtime headquarters of controversial boys' club for the world's wealthiest and most powerful.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

Tenacious mummies survived dental problems, eternal entombment, and more than their fair share of devastating fires.

A promotional sun clock on the site of San Francisco's great raceway.