The haunting ruins of Jack London's dream house.

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.

This abandoned boat was left in place thanks to its rotting beauty.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

A ruined hotel with an unlucky history and an eerie present.

A whimsical antique shop with a strong air of mystery, filled with items from ages, and what feels like worlds, past.

A brooding mansion of clinker brick stands out among the Victorian houses of Pacific Heights.

A Barbary Coast watering hole built into a Gold Rush shipwreck.

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

Its buzzing collection honors vibrator history.

In this century-old literary safehouse, print is alive and well.

Longtime headquarters of controversial boys' club for the world's wealthiest and most powerful.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

Playable, historic pinball machines fill this Alameda museum.

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

San Francisco Bay's ghost town.

This odd California folly seems like it was almost designed to accumulate urban legends.

The largest permanent Monopoly board makes one of the longest games even bigger.

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

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

A strange house built only at night, with rumored mystic inspiration.

Two rocks in a perpetual kiss and one of "the most romantic spot in America."

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.