A monument to the love people have for their pets.

Guns that have been defending San Francisco since 1904.

The United States' first transcontinental automobile road came to its end at this spot in San Francisco's Lincoln Park.

Shoot for par over the bodies of the dead on this cemetery-cum-golf course.

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

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

A hidden gem, named after a San Franciscan icon, offers spectacular views of the Pacific Ocean.

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

The key to turning shifting dunes into the green oasis of Golden Gate Park.

A miniature view of the park, caught in time.

Depicting scenes of everyday life - and specific individuals - in Great Depression era San Francisco.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

This grinning pup statue is all that's left of what was once a ubiquitous Bay Area diner chain.

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

The most beautiful Taco Bell in the world even has surfboard parking.

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

A 1920s speakeasy that had rum runners racing up and down the shores of California.

A giant statue perched on dumpsters watches over the freeway.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

This controversial depiction of the "Founder of California" looks as though it was sculpted from mashed potatoes.

A comprehensive collection of Pez dispensers.

A large instrument played by the wind.

Radioactivity still cause for concern at this urban explorer's paradise.

For nearly 50 years, this San Francisco nonprofit has been serving as a mix of recycling center and art school.