Its dark depths conceal millions of rare, delicate crystal formations.

The timepiece that exonerated a labor radical accused of a parade bombing that killed ten people.

Thousands of turbines whir at at the origin of North American wind power.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

Rising out of miles of farmland, these buttes are sometimes called the world's smallest mountain range.

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

A decommissioned Naval base now rents itself out for people who want to blow stuff up.

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

I Street Bridge is the heaviest swinging center bridge in the United States.

A chain of bells connect the California Missions and honor the legend of the "King’s Highway."

Frank Lloyd Wright died a year before construction on his largest public project even began.

This 19th century train workshop is a treasure trove of railroad history.

This municipal playground was co-created by the father of one of the most playful characters ever.

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

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

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

A huge collection of rocks, gems, and crystals.

Before it was abandoned and left to rust alongside the road, this riverboat starred in a John Wayne movie.

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

The beauty and the beast of hydraulic mining is on full display at this California Historic State Park.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

A bright California graveyard with a decidedly dark side.

Concrete strongholds stand guard over the Golden Gate.

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