A 140-year-old castle with underground caves hidden in San Francisco.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A huge musical instrument played by the ocean.

This beautiful ridge-top trail is dotted by tiny homes apparently built by a group of itinerant fairies.

One man's quest for the ultimate road trip vehicle.

This San Diego museum, housed in a former Navy training facility, is dedicated to preserving women’s historic achievements.

Swarms of butterflies cannot compare to the awe inspired by the publicly-funded nakedness once displayed in this sunken garden.

Lemon Grove, California is known for its giant lemon...and mummified bodies.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

San Diego's most historic and haunted home.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

A "haunted" landmark on the coast of Southern California.

Remains of a Greek freighter trapped off of Rocky Point in 1961.

America's most famous piece of self-built architecture.

Gnomes have their very own bonsai-landscaped settlement on a university campus.

Every weekend, the parking lot of this Buddhist temple turns into a Thai street-food paradise.

This peaceful garden is hidden on the grounds of a spiritual organization founded by a pioneer yogi.

A fashion designer's dazzling world of Japanese collectibles is hidden in a warehouse downtown.

A long-vacant Scottish Rite temple in Hollywood has been converted into an art museum filled with Masonic relics.

Friendships have been forged over ham and eggs every Wednesday morning for nearly a century.

An academy where anyone can train in the exciting acrobatic sports of parkour and freerunning.

A quirky collection of figurines backdropped by city views is hidden next to a popular restaurant in the Hollywood hills.

Two men, two visionaries of Venice Beach, one little hotel that smells like cookies.

The quiet canyon has a tumultuous history involving a doomsday cult.