A famous alternative culture epicenter and where Joplin serenaded young hippies.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A 140-year-old castle with underground caves hidden in San Francisco.

A psychedelic labyrinth on the San Francisco bay.

Radioactivity still cause for concern at this urban explorer's paradise.

A rococo retro-futurist future-rustic vernacular between yesterday’s tomorrow and the future that never was.

San Francisco Bay's ghost town.

Masterful ceramic fountain and map of the Pacific Basin.

Eclectic collection of dark and macabre antiques.

A creepy steel gremlin has protected the Bay Bridge since 1989.

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

One of the best absinthe distilleries in the United States.

Once the largest winery in the world, this castle-like building now sits abandoned on the San Pablo/San Francisco Bay shore.

Antiques by the Bay.

Its dark depths conceal millions of rare, delicate crystal formations.

The haunting ruins of Jack London's dream house.

Junkbots and mud babies are the masterpieces in this fantastically sci-fi art museum.

This mountaintop beacon is only lit three times a year but shines like some kind of all-seeing eye.

The fossilized remains of ancient California redwoods.

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

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

A ruined hotel with an unlucky history and an eerie present.

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.

Wheels of chrome by the thousands adorn this California Historical Landmark.