A popular tourist cave with a dark past.

A lighthouse built to save lives that took quite a few with its treacherous location.

Canyon walls shrouded in ferns.

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

This abandoned motel doesn't welcome guests anymore, but decay and a creepy atmosphere still call it home.

This graffiti-covered bridge is the quintessential vision of a place for disillusioned youth to escape the complexities of burgeoning adulthood.

A huge collection of rocks, gems, and crystals.

The largest drain hole in the world.

The haunting ruins of Jack London's dream house.

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

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

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.

Massive prehistoric mammals used these stones as oversized scratching posts.

The southernmost outpost of the Russian Empire in colonial America.

The mysterious round rocks of Schooner Gulch.

One of the largest Buddhist communities in the West sits on the site of an old hospital.

Home of what was the largest hydraulic mine in the world, producing gold and the first diamonds in the U.S.

The long, arduous journey of the stones of the Abbey of New Clairvaux.

One of the largest fleets of armored vehicles in the world, sitting out in the California desert.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

This lesser known Hearst estate is a fairytale village built from the stolen bones of historic European buildings.

Experience the "opulence, grace, and grandeur of Eureka's most famous Victorian Inn."

Commonly referred to as the most photographed Victorian home in the United States.

A Tibetan Temple and Buddhist organization just off the beaten path in Northern California.