A modest reminder of treacherous waters at the Golden Gate.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

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

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

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

Its buzzing collection honors vibrator history.

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.

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