Legend says train robbers stashed their gold within the depths of this unusual cave.

Limestone caves with spectacular showcase chambers.

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.

"Only the devil could play golf here."

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

The American rainmaker and a burst dam.

The world’s largest concentrated solar plant generates as many problems as megawatts.

This unique graffiti art from the 1940s has become a staple of this local landscape in the remote California desert.

The remnants of an early automobile route across shifting sand dunes can still be found in the deserts of Southern California.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

A remote desert lookout offers unparalleled views of the California badlands for those who brave the trek.

A 19th-century cabin built into a hollowed-out Sequoia tree.

This giant temperature attraction created some giant electric bills.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

Each winter this underground cave forms a dazzling ice palace.

A massive hydrovolcanic explosion left a half-mile wide crater in Death Valley.

This rock formation named for its unique shape is one of many that call the Alabama Hills home.

The decaying adobe remains of an old homestead are just off the beaten path in Joshua Tree National Park.

A strenuous, unofficial trail leads to spectacular views in one of America's most remote national monuments.

Not truly a ship nor a building, the Navy's first and last "landship" is now abandoned due to clerical issues.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

Two mammoth statues inspired by equally tall tales lure tourists to this roadside attraction.

The southernmost outpost of the Russian Empire in colonial America.

Massive prehistoric mammals used these stones as oversized scratching posts.