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

Hidden above a drug store on a nondescript corner of Lincoln Heights is a private clubhouse for intrepid explorers.

A hidden subterranean installation offers a view of the sky.

World War II-era Nazi compound nestled in the Santa Monica hills.

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

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

From pre-war whiskey cocktails to prohibition-era speakeasy secrecy, this bar has seen it all.

One of the ghostly stops along Route 66.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

An expansive book store, art gallery, and curio shop with wares ranging from tarot cards to novelty socks.

A storybook European village in Berkeley.

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

Dozens of feral felines rule a segment of Hollywood's only graveyard.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

The ghost town that ended up on Ebay.

The largest drain hole in the world.

The restored and active Victorian-era final resting place of San Francisco.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

One of the last free public hot springs is decorated with hippie art.

A shrine to a skeleton saint in the city of angels.

The unbelievably opulent home built for an infamous newspaperman.

This hilltop park offers magnificent views and a Frank Lloyd Wright masterpiece.

A multimedia experience that chronicles the atrocities of racism.

Abandoned bridge hidden deep in the San Gabriel Mountains.