A psychedelic labyrinth on the San Francisco bay.

Exotic feline breeding compound and conservation center.

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

One of the ghostly stops along Route 66.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

The site of murders and Satanic cult gatherings.

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

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

Travelers exchange letters with woodland creatures at this mini post office.

A storybook European village in Berkeley.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

An inconspicuous footbridge beloved by San Diego locals.

The largest drain hole in the world.

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

Abandoned bridge hidden deep in the San Gabriel Mountains.

The remains of a ruined mansion memorialize the 1906 earthquake.

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

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

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

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

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

A ghost town at the airport is now a refuge for blue butterflies.

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

Eons old volcanic activity created one of the most stunning rock formations in the United States.