San Francisco Bay's ghost town.

The unbelievably opulent home built for an infamous newspaperman.

One of the ghostly stops along Route 66.

San Diego's most historic and haunted home.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

The site of murders and Satanic cult gatherings.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

The ghost town that ended up on Ebay.

The largest drain hole in the world.

In a city filled with Frank Gehry buildings, one stands out as one of the architect's weirder works.

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

This brightly made over hotel hides decades of suicide, serial killers, and mysterious deaths.

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

This grand mansion has starred in everything from Bones to Buffy.

Visible below the waves are memorials to the city's Gold Rush dead.

"Looks so real, it's scary!"

A collection of 20th-century automata, penny arcade games, and musical contraptions.

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

The private clubhouse for the members of the Academy of Magical Arts.

A strange house built only at night, with rumored mystic inspiration.