The ruins of the castle that chemicals built.

The hotel room where Janis Joplin tragically died has now become a makeshift shrine to the singer.

A world-class observatory in the California desert.

The liveliest ghost town in the state.

Megachurch turned Catholic church comprised of 10,000 glass panes.

A ruined hotel with an unlucky history and an eerie present.

Home to the "Circus" trees created by Axel Erlandson.

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

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

A former utopian healing center created by a huckster and built by derelicts.

One of the oldest reform schools in the United States, home to wayward boys such as Merle Haggard, now abandoned.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

Nancy Thompson's Home from "A Nightmare on Elm Street."

Acres of natural wonders left behind by a socialite-turned-gardener.

Hundreds of trees made from glass bottles make up this forest on Route 66.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

One of the ghostly stops along Route 66.

This ultra-modern home clings to the slope of the Hollywood Hills on a precarious stilt.

San Diego's most historic and haunted home.

An inconspicuous footbridge beloved by San Diego locals.

The largest drain hole in the world.

Abandoned bridge hidden deep in the San Gabriel Mountains.

Small museum packed with artifacts recovered by the man rumored to be the real-life inspiration for Indiana Jones.