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

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

The oldest badlands in North America, Makoshika State Park takes it name from the Lakota words for broken land.

This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.

An enormous artwork that colorfully celebrates over 150 years of US military achievements.

In the days before HD projectors and IMAX, some of the most powerful projectors belonged to planetariums.

A humble garage, world-famous for being the epicenter of a technology revolution.

Burping, gurgling geothermal mud pots by the Salton Sea.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

For 20 years, this whale skeleton has been slowly dripping oil on the floor of the museum where it hangs.

"The Most Boring Road in the State."

Over 600 vacuum cleaners stack the shelves of what may be the cleanest museum in America.

A small museum dedicated to the whimsical tool that turns sugar cookies into works of art.

A big museum full of little worlds.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Where the author wrote her beloved "Little House" books.

Entombed in this strange, white stone hill are the deadly remains of radioactive weapons production.

A museum dedicated to man's boldest venture.

The highest point in Montana is as rugged and singular as the state itself.

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

With over 340,000 artifacts and counting, there is something for everyone, often called the "Smithsonian of the West."

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

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

An entire town preserved as a historic landmark.