The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

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

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

Coastal dunes, site of buried Egyptian movie set and former utopian colony.

Storybook cottage in Beverly Hills was once the site of 1920s silent film studio, affectionately known as "The Witch's House."

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

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

The miraculous hydrant that saved the Mission District in 1906.

This old mining town, deep in the California desert, has a year-round population of one.

A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.

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

The location of the last stand of Charles Manson's doomsday cult.

A speck of nature and art in one of San Francisco’s most notorious neighborhoods.

This little blue house pokes out over the campus of UC San Diego, seven stories high.

Early prototype for Frank Lloyd Wright's Guggenheim.

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

This impressive tunnel was dug entirely by hand over the course of 36 years.

A popular tourist cave with a dark past.

The remains of a 12th-century chapter house in Golden Gate Park.

The abandoned train depot now doubles as a well-placed rest stop for those who take the road less traveled.

A house built from trash known as the poor man's Hearst Castle.

This Pringle-shaped ledge makes for the perfect photo op.

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