The largest drain hole in the world.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

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

A historic hotel in an old California railroad town with a rowdy reputation.

At night, a grove of towering redwood trees growing through the pavement block out all light from the so-called “Dark Park” of Madrone Avenue.

Come for the records, stay for the retro pinball machines.

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

The largest Star Wars collection in the world is its own galaxy of collectibles.

Home to an apple tree that can produce 25 different varieties of fruit.

Believe it or not, this is the final resting place of the man who created the Odditorium.

One of only five observatories in the world built to measure the Earth's wobble.

An ever-updating collection of retro Americana.

The southernmost outpost of the Russian Empire in colonial America.

A local dialect born in the late 19th century is only spoken in this isolated California valley.

Elephant seals and sea lions have turned the abandoned buildings on this island into their endangered love shack.

This 252 step staircase offers stunning views of San Jose.

The stately birthplace of California's statehood.

For almost 100 years, this site of peace and spirituality has existed on the California coast.

A tree grown from astronaut seeds which were exposed to cosmic rays.

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

The oldest house in the capital of Silicon Valley.

The world's most famous donkey lives in this pen.

800 apricot trees honor Silicon Valley's agricultural history.

Anyone can control this glittery light installation with just a phone call.