A promotional sun clock on the site of San Francisco's great raceway.

Ancient human, animal, and geometric figures drawn in the earth.

Tenacious mummies survived dental problems, eternal entombment, and more than their fair share of devastating fires.

A giant donut stands as a popular symbol of Los Angeles iconography.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

Handmade treasures from around the world.

Dive bar built out of the remains of a whaling ship.

Half of a house.

A playground built by the kids that is a child's wonderland, and a helicopter parent's nightmare.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

This dark, quiet forest on the outskirts of San Diego is dense with rumor and lore.

Ten 25-foot-tall, beehive-shaped kilns, abandoned in Death Valley.

Golden Gate Park's historic collection of plants.

Gold Rush-era tombstones line the park's paths.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

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

"Only the devil could play golf here."

A monument to the love people have for their pets.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

This turn of the century masterpiece has a mysterious goaty interloper.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

A world-class observatory in the California desert.

The restored and active Victorian-era final resting place of San Francisco.