Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.

Meet cowboys and ancient beardogs at this one-of-a-kind crossroads of Western history.

This historic Union Pacific Railroad depot is a stunning symbol of American post-Civil War progress.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

Named for a prominent scout and explorer, this Wyoming state park encompasses a replica of an 1840s trading post, a 19th-century Army outpost, and early 20th-century automobile lodgings.

This prison-turned-museum is a remnant of the Old West's grizzly, violent past.

A devilishly named gorge that was a sign of salvation for many pioneers.

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

The world's largest mineral hot springs is home to a herd of bison, a free public bath house, beautiful mineral formations, and a terrifying swinging bridge.

This archaeological dig site and museum is home to one of the largest dinosaur fossil collections in the world.

An unusual geological feature towers over the remains of a dark episode in United States history.

One man's ambition created this psychedelic log home.

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

Cabins once lived in by Butch Cassidy and the Sundance Kid are featured at this Old West living history museum.

A beautiful geyser under environmental threat.

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

An architect's childhood fantasy treehouse made real.

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

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

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

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

This massive redwood tree has a drive-thru tunnel carved out of its trunk.

This 19th-century museum inside of a lighthouse is only accessible during low tide.