The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Quite simply the largest tree in the world (by volume).

San Francisco's newly reopened hands-on science museum.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

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

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

High on a hill overlooking Los Angeles lives a world famous, high-power conical Tesla Coil.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

World's largest collection of serial killer artwork and other macabre exhibits.

Recovered from the brink of extinction, at home in the Financial District.

This print shop boasts one of the largest pinball arcades in San Francisco.

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

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

A large instrument played by the wind.

A 1920s speakeasy that had rum runners racing up and down the shores of California.

A unique piece of graffiti offers a little slice of local history and mystery.

Neoclassical Revival mansion and set of horror cult classic Phantasm.

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.

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