The Empire Mine is "one of the oldest, largest, deepest, longest and richest gold mines in California."

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

Graffiti-covered ruins that were once part of a farm owned by a mental hospital.

An old California photo stand has been turned into a shrine to the cozy art of crochet.

Oldest building in California still in use.

The sun acts as a key that only fits this giant keyhole twice a year.

A music-filled, booze-soaked oasis in the desert.

This Pringle-shaped ledge makes for the perfect photo op.

One of the world's longest murals depicts the history of diversity in Los Angeles.

Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

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

360-degree virtual reality chamber physically immerses scientists into their data.

Two rocks in a perpetual kiss and one of "the most romantic spot in America."

Where there's quartz, there must be gold. Thus is the story of the mines of Julian, and the titillating times of the Gold Rush.

On a barren hillside in the Yucca Valley, the recently restored Desert Christ Park has attracted pilgrims and kitsch hunters for over 50 years.

Golden Gate Park's historic collection of plants.

A regular looking rock with an unbelievable history.

A multimedia experience that chronicles the atrocities of racism.

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

Mexican food and folk art.