Most-visited and most-photographed slot canyon in the American Southwest.

Rippling sand dunes frozen in the Arizona rock.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

The United States Capitol's former columns still stand.

First LEED-certified gas station in the United States.

Historic funicular railway, believed to be the shortest railroad in the world.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

America's most famous piece of self-built architecture.

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

A hard-to-reach oasis in a desolate corner of Death Valley National Park.

A land of debatable treasure.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

The eerie ruins of an isolated abandoned town nicknamed "the Widowmaker" for its deadly gold mine.

The longest living non-clonal organisms on Earth.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

A picture-perfect town, perfect for blowing up.

This crumbling stump is all that remains of what was once thought to be the oldest living organism.

The largest man-made crater in the U.S. marks the spot where we once tested mining with nukes.

If you want to take a peek at Area 51, this is legally as close as you're going to get.

This tiny cluster of abandoned buildings looks like the future of the ghost town - today!

Graffiti, cars, and religion combine to create this jungle of scrap in the Nevada desert.

Mysterious meeting place for UFO hunters near Area 51.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.