Not truly a ship nor a building, the Navy's first and last "landship" is now abandoned due to clerical issues.

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.

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

The remains of a deserted steamboat sit rusting beside an old ferry pier and an abandoned train platform.

This subtle Berkeley paving stone actually marks off a lawless tube of air that extends into space.

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

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

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

An overlooked and unassuming engineering marvel.

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

A monument to the love people have for their pets.

Discover for yourself what Herb Caen referred to as "the best kept secret in the Bay Area."

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

Law-protected wreckage serves as a peculiar memorial for an almost forgotten World War II tragedy.

The only theatre in the world constructed specifically for sound movement.

Furniture tries to escape an abandoned building in San Francisco.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Masterful ceramic fountain and map of the Pacific Basin.

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

A playground built by the kids that is a child's wonderland, and a helicopter parent's nightmare.

Abandoned landscape once home to "the world's largest winery."