At the time of its completion, it was the tallest dam in the world.

One home in the historic strip hides secret compartments and the ghostly songs of long-gone canaries.

The old fire tower is one of the last of its kind in the United States.

New fungal and bacterial species call this deadly lake home.

A beautiful geyser under environmental threat.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

Mining town from the late 1890s, once home to Calamity Jane.

An entire town preserved as a historic landmark.

These giant metal horses graze on a hilltop near the Montana highway.

For thousands of years, Native American hunters drove buffalo straight off this cliff in Montana's Yellowstone Country.

See the computer’s history revealed over the course of 20,000 years.