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

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

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

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

This shop specializes in oddities and Victorian-inspired wonders.

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

Olfactory delights in San Francisco's Botanical Gardens.

A museum befitting the city responsible for supplying the majority of the world's LSD.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

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

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

A huge musical instrument played by the ocean.

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

A winding path built in secret on the edge of the continent.

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

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

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

A psychedelic labyrinth on the San Francisco bay.

The haunting ruins of Jack London's dream house.

Abandoned bridge hidden deep in the San Gabriel Mountains.

One woman's Viking Castle on Lake Tahoe.

One of the oldest reform schools in the United States, home to wayward boys such as Merle Haggard, now abandoned.

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