A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

This museum glorifies the humble potato.

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

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

Limestone caves with spectacular showcase chambers.

This is one really big nut.

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

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

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

These aggressively sustainable art homes look like something out of 1970's science fiction.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A motel dedicated to Southwestern nostalgia.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

Every year, festive decorations appear on this juniper tree located in the median strip of a busy highway.

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

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.