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

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

A modest reminder of treacherous waters at the Golden Gate.

This painted marvel is San Francisco's 400-foot ode to urban biking.

The oldest lawn bowling club in the United States.

A monumental cross hides in the trees in Golden Gate Park.

The remains of a ruined mansion memorialize the 1906 earthquake.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

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

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

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

One of the last remnants of the city's Chinese nightclub scene is now a dive bar selling killer mai tais.

Chevron maintains one “Standard” brand station per state so it doesn’t lose the trademark.

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 operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

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

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

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

Faceless white figures loom over the city from the rooftop.

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

Created in 1972, the famous sculptor's intricately detailed monument to San Francisco is overflowing with city landmarks.

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