Stroll the grounds built by murder, suicide, and dirty oil money at one of Hollywood's most filmed mansions.

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

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

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.

The largest permanent Monopoly board makes one of the longest games even bigger.

San Diego's most historic and haunted home.

One of the ghostly stops along Route 66.

San Francisco Bay's ghost town.

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

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

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

The site of murders and Satanic cult gatherings.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

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

Most famous work of one of Frank Lloyd Wright's sons.

Exotic feline breeding compound and conservation center.

A storybook European village in Berkeley.

A modern day curiosity cabinet.

The largest drain hole in the world.

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

Abandoned bridge hidden deep in the San Gabriel Mountains.