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

An optical illusion found amid a logged redwood forest.

Located on 420 acres in the high desert, this spiritual center is dedicated to the "science of the future."

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

Acres of natural wonders left behind by a socialite-turned-gardener.

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

Rainbow-hued local gem in Venice.

The programmatic glory of LA's giant whiskey barrel building has become an upscale reminder of the city's kitschy roadside past.

Home to the "Circus" trees created by Axel Erlandson.

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

This serene oasis in an affluent Los Angeles neighborhood holds some of Gandhi's ashes and got Elvis into Eastern Philosophy.

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

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

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