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

Miraculous tree that seems to sprout out of solid rock.

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

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

A miraculous natural phenomenon known as "the spring that breathes."

One of the smallest towns in the United States.

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

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

A beautiful geyser under environmental threat.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

The first declared National Monument in the United States.

Native Americans built this circle of stones, which was used to predict astronomical events.

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

After Havre burned down, the best place to build was under the ashes.

"Polynesia on the Plains."

This amazingly preserved Gold Rush town is a historian's dream.

Mining caused an asbestos emergency in this small town.

The only road through the heart of Glacier National Park.

The rocks of a certain area of Butte, Montana give off a musical ring when hit.

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

New fungal and bacterial species call this deadly lake home.

A 6-mile-long lake created by an apocalyptic seismic event and the deadly chain reaction that ensued.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

This record-setting hydraulic dam in the Montana badlands was one of FDR's most ambitious public works.