The first fresco Diego Rivera painted in the United States can be found in the former San Francisco Stock Exchange.

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

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

Perfect your fly fishing technique on their practice ponds.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

This tall and trim architectural oddity is one of the skinniest buildings in San Francisco.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

Its buzzing collection honors vibrator history.

A pair of mutilated bronze octopuses slump at the base of the monument honoring California's admission to the U.S.

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

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

A hidden subterranean installation offers a view of the sky.

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

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

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

The miraculous hydrant that saved the Mission District in 1906.

Over a century old, this restored Victorian building is surrounded by a lush garden filled with rare palms.

Sitting atop San Francisco's tallest hill, a cross honors the victims of the Armenian genocide.

This painted marvel is San Francisco's 400-foot ode to urban biking.

The oldest lawn bowling club in the United States.

San Francisco’s century-old Christmas Tree.

A former hardware store near Yerba Buena is the official home of California's history.