An optical illusion found amid a logged redwood forest.

Commonly referred to as the most photographed Victorian home in the United States.

A trash dump made beautiful by nature's power.

A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.

This whimsical seashell-shaped place of worship was designed to blend into its surroundings.

The southernmost outpost of the Russian Empire in colonial America.

A poignant memorial to a young boy whose death spurred a dramatic increase in organ donations in Italy—dubbed the "Nicholas Effect."

Once the gateway to the utopian dream-village of a Civil War embalmer.

One of the last remaining Carpenter Gothic churches is situated on a wildflower conservatory overlooking the bay.

Concrete strongholds stand guard over the Golden Gate.

This abandoned boat was left in place thanks to its rotting beauty.

An enchanting tunnel of cypress trees leads to an old morse code station still used today.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A huge musical instrument played by the ocean.

An artsy hidden staircase leads to breathtaking views of San Francisco.

The remains of a ruined mansion memorialize the 1906 earthquake.

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

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

A hidden subterranean installation offers a view of the sky.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

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

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

The legendary statue-hating superintendent of Golden Gate Park is honored with... a statue.