One man's vast collection of artifacts and ephemera from matchbooks and postcards to vintage neon signs and cars.

San Francisco's newly reopened hands-on science museum.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

A library of rare occult books in Los Angeles.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Resting place of Hollywood's immortals is also site of summer film screenings.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

A 140-year-old castle with underground caves hidden in San Francisco.

The legendary building that needed ghostly approval before being built.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

Former self-sufficient mental institution now a planned community.

A formerly abandoned mental institute, now back in business.

A haunted hot springs hotel that went from healing retreat to asylum before it was restored.

Once known as the Illinois Asylum for the Incurable Insane.

This former asylum for Black Americans is haunted by its history of violence and racism.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

An exhibit of items from the mental institution where Mary Todd Lincoln lived after her son conspired to have her committed.

A subterranean world of tunnels links several buildings of this rare 19th-century asylum.