Perfect your fly fishing technique on their practice ponds.

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

Home to one of the world’s largest collections of model yachts.

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

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

A miniature view of the park, caught in time.

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

Visible below the waves are memorials to the city's Gold Rush dead.

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

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

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A monument to the love people have for their pets.

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

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

Where a staggering 747 ships were constructed during World War II.

Internationally-recognized arts center housed in a century-old former military barracks.

Concrete strongholds stand guard over the Golden Gate.

A living time capsule of the 1960s Richardson Bay water-front.

The former Naval shipyard is open for exploring - mostly.

The southernmost outpost of the Russian Empire in colonial America.

'Cause the fence start shaking, the earth was quaking.

Massive prehistoric mammals used these stones as oversized scratching posts.

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.

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