A B&B on a Victorian lighthouse station in San Francisco Bay.

This museum looks at the history of one of America's most famous prisons and most beloved albums.

Gold Rush ship-turned-hotel buried underneath San Francisco's financial district.

A small medical museum with a recreated doctor's office.

Before it was abandoned and left to rust alongside the road, this riverboat starred in a John Wayne movie.

Graffiti-covered ruins that were once part of a farm owned by a mental hospital.

Semi-recognized center of the world, with many oddities.

This residential door allows San Francisco muggles a glimpse at the wizarding world.

A cobblestone alley with an interesting past.

Bits and pieces from the ill-fated Donner Party's winter cabins.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

“It's the quality” (but probably also the drive-through donut tunnel) that has attracted diners since 1968.

A vast city of the dead, where the deceased outnumber the living by more than a million.

The overgrown ruins of a once thriving World War I-era copper mine.

The rusting remains of the largest assembled WWII fleet on the West Coast.

Gorgeous purple flowers drape from the world's largest blossoming plant.

Where there's quartz, there must be gold. Thus is the story of the mines of Julian, and the titillating times of the Gold Rush.

A beloved carnival gets a modern makeover in Los Angeles.

A walk down memory lane in the heart of one of San Francisco's most notorious neighborhoods.

A man-made island in scenic San Francisco Bay.

Nursery with extensive collection of flesh-eating plants operated by the author of "The Savage Garden."

The illuminating collection of L.A. street lights is run by the city and only opens one day per month.

The oldest bar in Missouri is hidden within a limestone brewery cellar more than 50 feet underground.

An atmospheric, medieval-themed book store hides in a 13th-century underground space.