This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

This massive redwood tree has a hole in the base big enough to drive through.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

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

Historic marionette theater features thousands of handmade puppets and free cups of ice cream.

A 300-ship graveyard, with a few still visible at low tide.

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

Eons old volcanic activity created one of the most stunning rock formations in the United States.

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

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

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

A "Titanic" superfan changed his name to Jack and set up this strange shrine to the blockbuster, complete with Korean food and Tarot readings.

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

Canyon walls shrouded in ferns.

An inconspicuous footbridge beloved by San Diego locals.

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

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

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

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

One man's vast collection of artifacts and ephemera from matchbooks and postcards to vintage neon signs and cars.

A hotel and restaurant serving as the mecca of kitsch.

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