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

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

These subterranean storage areas hold emergency water reserves.

A rough granite monument marks the spot where Europeans first caught sight of the San Francisco Bay.

Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

Abortion, prohibition, religion, war, and fear all play a part in the history of this idiosyncratic Pacifica castle.

A large instrument played by the wind.

From sax to spuds, get 'em all at this landmark music establishment.

The final resting place of the Emperor of the United States and Protector of Mexico.

The peaceful gravesite of a rugged wild west gunman echoes the touching story of his last days.

A vast city of the dead, where the deceased outnumber the living by more than a million.

Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

Tenacious mummies survived dental problems, eternal entombment, and more than their fair share of devastating fires.

A promotional sun clock on the site of San Francisco's great raceway.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

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

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

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

The miraculous hydrant that saved the Mission District in 1906.

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

Gold Rush-era tombstones line the park's paths.

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

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