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

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

At HopCat, a marker honors fictional creatures with the ability to travel the missing dimensions of Kcymaerxthaere.

Mining caused an asbestos emergency in this small town.

A smoke stack so large, the Washington Monument could fit inside!

Derelict buildings are all that remain of a complex at the site of one of the worst mining disasters in Montana history.

The only road through the heart of Glacier National Park.

The world's longest known cave system.

Boise State's stadium was the first non-green football field in the world.

A museum dedicated to the history and art of staying clean.

A small section of Boise, Idaho maintains the unique culture and traditions of the Basque people.

Jail from the 19th century that was built by inmates.

These black pillars of volcanic basalt seem to call mountain climbers with an unbreakable siren song.

A former gold rush boomtown has managed to stay in business for over 100 ramshackle years.

Home to the deepest rift anywhere on Earth.

A popular rock that acted as a waymarker for American pioneers.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

Surrounded by a hundred mile radius of billboards, Little America is a roadside attraction whose primary appeal is hospitality.

This mining town boomed in the Atomic Age when uranium was gold, only to be abandoned when the industry collapsed.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

An architect's childhood fantasy treehouse made real.

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

A beautiful geyser under environmental threat.