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

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

Fake rail crossings mark the site of an influential doctor's demise.

Steinbeck's old stomping grounds, immortalized in Cannery Row.

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

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

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

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

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

The oldest Naval cemetery on the West Coast.

The former Naval shipyard is open for exploring - mostly.

The fossilized remains of ancient California redwoods.

Massive prehistoric mammals used these stones as oversized scratching posts.

This massive redwood tree has a hole in the base big enough to drive through.

An optical illusion found amid a logged redwood forest.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A vertically floating hemlock controls the waves and weather at Crater Lake.

A stunning landscape of bunkers that once stored chemical weapons.

Home to the deepest rift anywhere on Earth.

Supposedly Satanic numbers adorn this preserved submarine sail.

A 6-mile-long lake created by an apocalyptic seismic event and the deadly chain reaction that ensued.

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.