These millipedes glow not out of attraction, but as a not-too-subtle warning.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

The abandoned personal amusement park of the King of Pop.

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

A storybook European village in Berkeley.

Everyone remembers Laurie Strode from Halloween, but this is the house where most of the blood was shed.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

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

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

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

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

Magical-looking cottages that inspired one of the most famous animated films ever.

An inconspicuous footbridge beloved by San Diego locals.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

A modern mechanical planetary system, part of a 10,000 year clock.

A faux European lane smack dab in downtown L.A.

Historic funicular railway, believed to be the shortest railroad in the world.

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

Canyon walls shrouded in ferns.

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

A hotel and restaurant serving as the mecca of kitsch.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.