At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

This print shop boasts one of the largest pinball arcades in San Francisco.

An art supply shop holds the secrets of this quiet neighborhood's raucous Barbary Coast past.

This giant head is all that remains of a once proud statue that survived an earthquake but not a fall off of a wagon.

An enormous illuminated figure dances on the Las Vegas strip.

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

This 19th-century church is now a popular roller rink.

A pair of mutilated bronze octopuses slump at the base of the monument honoring California's admission to the U.S.

Early prototype for Frank Lloyd Wright's Guggenheim.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

This turn of the century masterpiece has a mysterious goaty interloper.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

A hidden subterranean installation offers a view of the sky.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

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

A collection of 20th-century automata, penny arcade games, and musical contraptions.

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

Its buzzing collection honors vibrator history.

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

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

A psychedelic labyrinth on the San Francisco bay.

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

Feeding hungry Ballard boat workers since 1922.