Early prototype for Frank Lloyd Wright's Guggenheim.

San Francisco Bay's ghost town.

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

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

Bonsai garden in Oakland is curated by the first non-Japanese female bonsai master in the United States.

A bigger-than-life pun that has become a beacon of altruism.

A tree grown from astronaut seeds which were exposed to cosmic rays.

This eagle-topped spire remembers the military commander who snatched up California for the United States.

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

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

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

A strange house built only at night, with rumored mystic inspiration.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

A shape-shifting buy-sell-trade bookstore, born to Beatnik Era spirit.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

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

The oldest continuously operating church in California.

Julia Morgan's Moorish-Gothic labyrinth of fountains, trees, natural light and Oakland's notable dead.

This mysterious series of teeny guerrilla installations sheds a whimsical light on street art in Oakland.