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

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

One of the ghostly stops along Route 66.

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.

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

A storybook European village in Berkeley.

This unlicensed collection of fast-food memorabilia sits on the site of the first ever McDonald's restaurant.

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

The largest drain hole in the world.

The ghost town that ended up on Ebay.

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

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

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

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

This private residence was the template for one of the most beloved television homes of all time.

The unbelievably opulent home built for an infamous newspaperman.

A multimedia experience that chronicles the atrocities of racism.

Abandoned bridge hidden deep in the San Gabriel Mountains.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

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

The site of murders and Satanic cult gatherings.

Fourteen curious and controversial white bunnies sit in a circle near Newport Beach City Hall.

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