The unedited photograph called "Bliss" has graced the screens of over a billion computers.

The haunting ruins of Jack London's dream house.

A tribute to the life and work of the beloved "Peanuts" cartoonist.

Special tunnels built so that frogs won't be killed when crossing the highway.

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

A classic advertising icon immortalized in regal bronze.

Prone to disastrous fires, the city of San Francisco has the Guardian, a fireboat gifted by residents, to watch over them from the bay.

A free, public museum dedicated to the fascinating science of sight.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

A Barbary Coast watering hole built into a Gold Rush shipwreck.

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

The oldest alley in San Francisco is paved with a reminder of the city's original shoreline.

The largest whiskey stash on the West Coast survived the 1906 fires--but not without heroic effort.

Gold Rush ship-turned-hotel buried underneath San Francisco's financial district.

These six walrus head statues harken back to a time when this area wasn't far from the oceanfront.

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

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

The last used bookstore in Downtown San Francisco is one of the smallest bookstores just about anywhere.

Faceless white figures loom over the city from the rooftop.

A shining, cold, black organ lies in San Francisco's financial district.

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

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

This museum looks at the history of one of America's most famous prisons and most beloved albums.

A blend of sporting history mixed with childhood nostalgia await visitors to this museum.