Visible below the waves are memorials to the city's Gold Rush dead.

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

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

Canyon walls shrouded in ferns.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

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

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

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

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

A hotel and restaurant serving as the mecca of kitsch.

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

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

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

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

Towering basalt columns, a creation of fire and ice.

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

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

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Resting place of Hollywood's immortals is also site of summer film screenings.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

A 140-year-old castle with underground caves hidden in San Francisco.

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