The site of a defunct mill, that once supplied marble for the construction of the Lincoln Memorial.

All that remains of this once-booming mining town are the ruins of a saloon.

Underground tunnels remain beneath this abandoned mental asylum.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

Ruins of a historic medical facility sits eerily by the water.

This abandoned psychiatric hospital once housed more than 4,000 patients in the middle of a quaint New England town.

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

The intriguing personal collection of a professional demon-chaser.

This old-world mansion with lush gardens is a gem in the heart of Silicon Valley.

This 1920s masterpiece of French Quarter architecture hides a secret tunnel used by Albert Einstein.

Where the rich wintered in Pasadena.

A repository of Pasadena history.

This California estate was either haunted by ghosts or the Marx brothers.

A master of deception, Harry Houdini's greatest trick may have been living in two places at once.

An expansive and intricately restored mansion remains from over a century ago--and so do its ghosts.

Hollywood's oldest hotel is the site of the first Academy Awards, the birthplace of Marilyn Monroe's career, and the home of Montgomery Clift's ghost.

The Empire Mine is "one of the oldest, largest, deepest, longest and richest gold mines in California."

Abortion, prohibition, religion, war, and fear all play a part in the history of this idiosyncratic Pacifica castle.

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

Bits and pieces from the ill-fated Donner Party's winter cabins.

Once a place of peaceful repose, this sanitarium now faces an uncertain future.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.