Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

A public fountain that spouts "health water" from a nearby spring.

This natural marble cave is one of only five national monuments in Oregon.

Canyon walls shrouded in ferns.

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

A vaudeville performer mounted this hollowed-out redwood log onto the chassis of a truck, and toured the country spreading a message of conservation.

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

The mysterious round rocks of Schooner Gulch.

This whimsical seashell-shaped place of worship was designed to blend into its surroundings.

The southernmost outpost of the Russian Empire in colonial America.

This abandoned boat was left in place thanks to its rotting beauty.

An enchanting tunnel of cypress trees leads to an old morse code station still used today.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

The haunting ruins of Jack London's dream house.

Over 300 taxidermied animals in a Californian restaurant make for a taxidermist's dream and an animal lover's nightmare.

This mountaintop beacon is only lit three times a year but shines like some kind of all-seeing eye.

Oakland's beautiful monumental cemetery.

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

After serving in World War II and picking up Apollo astronauts, this aircraft carrier has been turned into a museum overlooking the San Francisco Bay.

Guarded by the Angel of Grief, the Stanford family tomb attracts an odd mix of halloween revelry and somber contemplation.

A hidden world of exotic succulents and cacti.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

This giant shopping mall still holds signs of its automotive past.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.