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

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

Tiki luxury on Nob Hill.

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

Olfactory delights in San Francisco's Botanical Gardens.

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

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

This shop specializes in oddities and Victorian-inspired wonders.

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

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