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

A garden oasis filled with flowers mentioned in the works of William Shakespeare.

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

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

Home of modern dancer famously strangled by her own scarf.

Longtime headquarters of controversial boys' club for the world's wealthiest and most powerful.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

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

The perfect spot for a picnic, right next to a giant ballistic missile.

The timepiece that exonerated a labor radical accused of a parade bombing that killed ten people.

An abandoned car and strange wooden debris are among the scattered remains of the old sand and gravel quarry.

Spiral labyrinth hidden in the hills above Oakland, CA.

The memorial to the victims of the Jonestown Massacre carries the names of 918 lost, including one name people wish wasn't there.

A private home built to resemble the shape of a microscopic creature.

A storybook European village in Berkeley.

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

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

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

The haunting ruins of Jack London's dream house.

A tribute to one man's legacy of improving the accordion's reputation.

Monumental sculptures of Patrick Amiot, constructed from debris, detritus, and determination.

Believe it or not, this is the final resting place of the man who created the Odditorium.

A tribute to the life and work of the beloved "Peanuts" cartoonist.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.