The United States' first transcontinental automobile road came to its end at this spot in San Francisco's Lincoln Park.

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

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

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

Home to one of the world’s largest collections of model yachts.

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

Thirteen trees representing the original thirteen colonies were planted with soil from historic Revolutionary battlefields.

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

Under the shadow of its towering parent tree, a rare specimen of sequoia produces ghostly white leaves.

An overlooked and unassuming engineering marvel.

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

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

The miraculous hydrant that saved the Mission District in 1906.

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

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

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

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

This Japanese treats shop may have been the first business to mass-produce fortune cookies in the United States.

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

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

Chevron maintains one “Standard” brand station per state so it doesn’t lose the trademark.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

Half of a house.