The ruins of Theodore Roosevelt's beloved ranch stand in a forgotten corner of a national park named after him.

The world's largest Holstein cow.

A true roadside icon standing on the same plains that the herds once roamed.

Three legendary, living albino buffalo roaming their pastures for all to see.

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

This rustic old building is said to be the most photographed barn in America.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

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

An architect's childhood fantasy treehouse made real.

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 first declared National Monument in the United States.

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

Mining caused an asbestos emergency in this small town.

Modeled after a famous church in Vienna, Austria—but in Helena, Montana.

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

The only road through the heart of Glacier National Park.

A 1940s nuclear reactor built to produce plutonium for the Manhattan Project.

Nuclear reactor created the plutonium used on Nagasaki.

Site of the greatest known waterfall that ever existed.

An obscure waterfall that looks like something out of a fantasy novel.

During its heyday, 72 one-ton buckets from this dredge bore into the Powder River excavating vast gold deposits.

The unique circular corral belonging to the “Cattle King” of Oregon.

The largest wooden building in the world now houses a fascinating collection of aircraft.