Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

San Francisco's first World's Fair, dedicated to the wonders of California.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

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

A promotional sun clock on the site of San Francisco's great raceway.

This shop and studio is dedicated to the art of the book, from letterpress to bookbinding.

A hidden subterranean installation offers a view of the sky.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

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

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

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

San Francisco's newly reopened hands-on science museum.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

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

This shop specializes in oddities and Victorian-inspired wonders.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

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

A psychedelic labyrinth on the San Francisco bay.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.