When ecosystems collide in the arid Southwest.

The highest bridge in America was built for an almost unnervingly small amount of money.

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

A whimsical, punny collection of "fence art" outside the tiny mountain town of Baker, Nevada.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

A tree bears footwear on the loneliest road in America.

This Old West eatery along America's Loneliest Road was originally a stop on the Pony Express.

The grandson of a Kiowa chief created what has become the iconic symbol of a city on the Plains.

The United States's largest hand-dug well is topped with a state-of-the-art museum.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

The highest point in Texas is capped by a big silver pyramid.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

A clear blue swimming hole with hidden caves, still unexplored.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This is one really big nut.

Home of the International Space Hall of Fame.

A museum dedicated to the alleged Roswell Incident.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

A small burial plot formerly stranded in the middle of a road.

Millions of dollars worth of sculpture decorate this Iowa city center.