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

A library built during San Francisco's pioneer times is a student's retreat, bibliophile's sanctuary, and chess player's delight.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

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

A 300-ship graveyard, with a few still visible at low tide.

Floating man-made island and upscale restaurant.

A hidden subterranean installation offers a view of the sky.

An invitation-only museum of items natural and bizarre, arcane and exotic.

An essential stop before plundering, BYO Cutlass.

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

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

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

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

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

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

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

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

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

Furniture tries to escape an abandoned building in San Francisco.

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.

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