Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

This set of hot springs also comes with fantastic views.

Jail from the 19th century that was built by inmates.

A few dilapidated structures are all that remain of this deserted former silver mining town.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

This Wyoming town is fascinated by a particular mythical creature.

Surrounded by a hundred mile radius of billboards, Little America is a roadside attraction whose primary appeal is hospitality.

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

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

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

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

An architect's childhood fantasy treehouse made real.

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

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.

The remnants of a 1970 plane crash remain high in the Rocky Mountains.

This Colorado fire station has been in continuous operation for more than a century.

The temporary burial site of the man who shot and killed Jesse James.

This stone marker honors the man who released Canada goose goslings in Fort Collins, Colorado.

Take a self-guided tour through one of Colorado's most elevated mining districts.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.