Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

More than 700 species live within this murky marvel of a swamp on California's coast.

One woman's Viking Castle on Lake Tahoe.

Despite being a perfectly pleasant place to be, Loyalton can't seem to attract any visitors.

The viewpoint for this attractive, off-the-beaten-path waterfall is reached by a paved, wheelchair-accessible trail.

Massive prehistoric mammals used these stones as oversized scratching posts.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

The haunting ruins of Jack London's dream house.

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

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

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

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.

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

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.

The remains of a ruined mansion memorialize the 1906 earthquake.

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

Worker-owned cooperative and resource for those looking to lighten their ecological footprint.

Sporting Brutalist architecture, this school is hidden amid a quiet suburban neighborhood.

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

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

A 90-acre park on former landfill that hosts an annual kite festival.