This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A sharp bend in a dramatic river canyon cut through red rocks.

Most-visited and most-photographed slot canyon in the American Southwest.

This 3,500 pound obelisk was constructed with more than 1,000 reclaimed guns.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

An alley covered with 20 years of bubble gum.

A hotel and restaurant serving as the mecca of kitsch.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

The unbelievably opulent home built for an infamous newspaperman.

A massive volcanic plug is now a protected area that hosts a number of bird species.

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.

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

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

From the Difference Engine to the Cray-1, all under one roof.

The first high-tech company in the valley that actually worked with silicon devices.

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

A humble garage, world-famous for being the epicenter of a technology revolution.

This controversial depiction of the "Founder of California" looks as though it was sculpted from mashed potatoes.

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

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

Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

A rough granite monument marks the spot where Europeans first caught sight of the San Francisco Bay.