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

Gold Rush-era tombstones line the park's paths.

Golden Gate Park's historic collection of plants.

A monument to the love people have for their pets.

This turn of the century masterpiece has a mysterious goaty interloper.

This private residence was the template for one of the most beloved television homes of all time.

A hidden subterranean installation offers a view of the sky.

This shop and studio is dedicated to the art of the book, from letterpress to bookbinding.

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

A 300-ship graveyard, with a few still visible at low tide.

A modern mechanical planetary system, part of a 10,000 year clock.

Visible below the waves are memorials to the city's Gold Rush dead.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

San Francisco's newly reopened hands-on science museum.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

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

A museum befitting the city responsible for supplying the majority of the world's LSD.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

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

The only theatre in the world constructed specifically for sound movement.

A 140-year-old castle with underground caves hidden in San Francisco.

A winding path built in secret on the edge of the continent.

A huge musical instrument played by the ocean.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.