This mysterious petroglyph evokes the ancient swastika symbol but was later vandalized with the more troublesome Nazi one.

Elephant seals and sea lions have turned the abandoned buildings on this island into their endangered love shack.

A UFO scrapyard in the California desert.

The Los Angeles flood disaster that took 400 lives and ended the career of William Mulholland.

Guns that have been defending San Francisco since 1904.

A New England-style lighthouse along California's beautiful Highway 1 gets a re-do.

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

Where NASA's satellites and rovers phone home.

'Cause the fence start shaking, the earth was quaking.

North America's largest accredited model railroad museum.

The first life claimed by this record-breaking peak wasn't lost to exposure or a fall but rather lightning.

No one's quite sure why there's a metal megaphone bolted on two rocks in the middle of the Mojave Desert.

A pair of mutilated bronze octopuses slump at the base of the monument honoring California's admission to the U.S.

Where the writer penned his famous story about a jumping frog.

Happy harbor seals frolic and snooze on this warm, sandy stretch of coast.

This historic tower in the California desert promises visitors a "vortex of good vibes".

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

This sculpture garden in Death Valley makes you feel like you've slipped into some alternate reality.

Collective dedicated to restoring steam engines.

A tree grown from astronaut seeds which were exposed to cosmic rays.

NASA's leading space science lab started by a co-founder with deep ties to the occult.

This large collection of tiny things revels in the art of fine machinery well made.

A cozy bookstore is tucked within an old gold mine shaft beneath the cafe and ice cream shop.

Radioactivity still cause for concern at this urban explorer's paradise.