Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

A modern mechanical planetary system, part of a 10,000 year clock.

Most famous work of one of Frank Lloyd Wright's sons.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

This grand mansion has starred in everything from Bones to Buffy.

An inconspicuous footbridge beloved by San Diego locals.

A ghost town at the airport is now a refuge for blue butterflies.

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

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

A meditative space out of a fantasy story.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

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

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

The private clubhouse for the members of the Academy of Magical Arts.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

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

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

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