A quiet nook at the top of a little-known hilltop park named after California's first poet laureate.

A man-made island in scenic San Francisco Bay.

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

Deco Modern sculptures of the people of the Pacific, cast for the 1939 Golden Gate International Exposition.

An enormous artwork that colorfully celebrates over 150 years of US military achievements.

A storybook European village in Berkeley.

A brooding mansion of clinker brick stands out among the Victorian houses of Pacific Heights.

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

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

This residential door allows San Francisco muggles a glimpse at the wizarding world.

This sailor's boneyard was lost under a parking lot for decades before being rediscovered.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

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

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

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

Travelers exchange letters with woodland creatures at this mini post office.

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

The final resting place of a woman who never gave up on love.

Massive prehistoric mammals used these stones as oversized scratching posts.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

9,000 square feet of vintage and modern mechanical toys, dioramas & sideshow curiosities.

Concrete strongholds stand guard over the Golden Gate.

A porcelain company's former dumping ground, completely covered in pieces of collectible ceramics.

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