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

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

A modest reminder of treacherous waters at the Golden Gate.

A 300-ship graveyard, with a few still visible at low tide.

A miniature view of the park, caught in time.

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

Standing in for the first ship to navigate the Northwest Passage.

A creepy steel gremlin has protected the Bay Bridge since 1989.

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

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

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

A playing field for a popular French past time can be found tucked away in a quiet corner of Golden Gate Park.

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

Perfect your fly fishing technique on their practice ponds.

An enormous artwork that colorfully celebrates over 150 years of US military achievements.

A man-made island in scenic San Francisco Bay.

Guns that have been defending San Francisco since 1904.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The best place in the park to test out your throwing arm.

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

Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

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

A quiet marker in memory of local men and women lost in WWI.

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