California's own majestic geyser is powered by a subterranean volcano.

A man-made island in scenic San Francisco Bay.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

Playable, historic pinball machines fill this Alameda museum.

A giant donut stands as a popular symbol of Los Angeles iconography.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

An extensive collection of ancient Egyptian artifacts and mummies.

A collection of memorabilia from the Beat era in the back of a San Francisco bookstore.

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

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

This shop specializes in oddities and Victorian-inspired wonders.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Once featuring over 60 miniature replicas of famous Chinese locations, the Splendid China theme park was completely abandoned and is now mostly rubble.

The oldest house of worship in Palm Beach has a wonderful tropical garden.

The highway's southernmost spot is a beloved local attraction.

This railroad and oil tycoon's lavish estate now stands as a time capsule of the Gilded Age.

The largest retailer of seashells in the world.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

Town of spiritualists and mediums in Florida.