The tallest dam in Montana and top 10 in the country.

Thomas Francis Meagher drowned here in 1867, but whether his death was an accident or a murder, nobody knows.

A memorial to the most decisive Native American victory of the Plains Indian War.

The source of America's longest river is also a historical landmark and the start of a famous nude run.

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

A small Montana town commemorates the dog who waited at the train station every day for his owner to return.

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

Spectacular views await visitors to this lake.

An entire town preserved as a historic landmark.

This is one really big nut.

An abandoned fish-shaped drive-in gets a second life as a restaurant.

At 431 feet and 10 inches, this is the longest historic covered bridge in the United States.

The evolution of recreational vehicles and motorhomes is on display in the “RV capital of the world."

The metal bird, nicknamed "Sandy," stands nearly 40 feet tall and is an homage to the birds that migrate through North Dakota every year.

This municipal park along the Missouri River honors the galley central to the Lewis & Clark Expedition with a replica ship and sculptures.

Mining caused an asbestos emergency in this small town.

A colossal concrete penguin announces this Montana town as the coldest spot in America. But is it really?

This small museum is home to some of the oldest and best-preserved dinosaur specimens found in Montana.

A detailed, loving tribute to America's most isolated city.

This steamer is known as "The ship that built Cleveland."

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

Locally known as the "Onion” and the "Egg Beater,” Casper’s most recognizable buildings are beloved local landmarks to many, and eyesores to others.

This largest dinosaur tracksite in Wyoming is one of the only in the world from the Middle Jurassic Period.

One of the first intercontinental ballistic missile sites in the United States.