A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

Limestone caves with spectacular showcase chambers.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

The highest point in Washington state is a volcano covered in glaciers.

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

This historic national park is covered in the stunning ruins of red rock pueblos.

A motel dedicated to Southwestern nostalgia.

A tribute to Ponce de Leon's supposed quest for eternal youth.

When ecosystems collide in the arid Southwest.

One of the largest, oldest, darkest, quietest motel rooms in the world.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

See massive fossils that are over 200 million years old in northeastern Arizona.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Quite simply the largest tree in the world (by volume).

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A reproduction of earth's many biomes.

The world's longest known cave system.

The largest earthwork effigy in the world.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Odd outsider art installations surround a Gold Rush-era ghost town.

A beautiful geyser under environmental threat.