The beautiful 1920 Pantages Theatre remains hidden just underneath the LA Downtown Jewelry Exchange.

A Mysterious Masonic tomb in San Luis Obispo.

A library and museum dedicated to typography.

Hidden above a drug store on a nondescript corner of Lincoln Heights is a private clubhouse for intrepid explorers.

Half of a house.

The ruins of the castle that chemicals built.

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

The famous animator's private station house and man-cave was the birthplace of imagineering.

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

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

This shop and studio is dedicated to the art of the book, from letterpress to bookbinding.

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

The unbelievably opulent home built for an infamous newspaperman.

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

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

A meditative space out of a fantasy story.

The abandoned personal amusement park of the King of Pop.

The remains of a ruined mansion memorialize the 1906 earthquake.

A 300-ship graveyard, with a few still visible at low tide.

This massive redwood tree has a hole in the base big enough to drive through.

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

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

In this century-old literary safehouse, print is alive and well.