A huge musical instrument played by the ocean.

California's own majestic geyser is powered by a subterranean volcano.

The fossilized remains of ancient California redwoods.

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

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

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

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

The original place where water met land in the City by the Bay is outlined in brass.

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

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

The remains of a deserted steamboat sit rusting beside an old ferry pier and an abandoned train platform.

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

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

A 1920s speakeasy that had rum runners racing up and down the shores of California.

A massive volcanic plug is now a protected area that hosts a number of bird species.

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

A New England-style lighthouse along California's beautiful Highway 1 gets a re-do.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

Every weekend, people gather here for a brief chance to see their loved ones on the other side of the United States–Mexico border.

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

It should come as no surprise that the world's largest artichoke lies in the town that calls itself the "Artichoke Center of the World."

The former Naval shipyard is open for exploring - mostly.

Thousands of migrating monarchs overwinter clustered amongst the eucalyptus trees.

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