This elaborate tunnel is the first structure composed of cast concrete in the United States.

The words of the neighborhood's most famous poets adorn four concrete walls.

Legendary frontman of the Doors looms in this giant mural by famed Venice muralist, Rip Cronk.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

A second generation sun-powered marvel lights up the night.

View the California coastline (and the home of Barbara Streisand) inch by inch with stunning, government-sanctioned aerial photography.

At 130 years old and 126 feet tall, it is the largest known example of the rare Torrey pine tree.

This nonsensical smiling boat shuttles passengers between two places they could've easily walked between.

California's oldest wind harp represents a historic piece of America's Danish history.

Get up close to emus and ostriches, or buy their tasty meat.

With its peeling paint and faded sign, this theater-turned-recycling plant is a nostalgic relic of 1950s Americana.

An alley covered with 20 years of bubble gum.

A chain of bells connect the California Missions and honor the legend of the "King’s Highway."

Home to a forest of whimsical pygmy Coast live oak.

A massive volcanic plug is now a protected area that hosts a number of bird species.

The unbelievably opulent home built for an infamous newspaperman.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

Centuries of crashing waves carved out this small hole in the rock, which lights up at certain parts of the year.

A tree grown from astronaut seeds which were exposed to cosmic rays.

Haunting and beautiful trees, doomed to die.

Housed in a memorial lighthouse, this museum relays the history of surfing, beginning with the antics of royal Hawaiian teenagers.

This contorting sculpture is the tallest in San Francisco.