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

The steepest tramway in North America provides stunning views of the out-of-the-way Wallowa Mountains in northeastern Oregon.

A petroglyph map of the upper Snake River carved by prehistoric hunter-gatherers.

A volcanic core jutting above the plain between the Snake and Boise Rivers, a marker identifies the reference point for all U.S. Government Surveys in Idaho.

When in Idaho, sleep in a giant potato.

This underground cave located in the most barren reaches of Idaho is filled with ice year-round.

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

Dozens of rockets and missiles are on display outside a testing facility in the Utah desert.

This now-abandoned part of the original transcontinental railroad route provides a surreal driving and historical experience.

Designed in 1887, this clock from the county office clock tower has been restored and is on full display.

This massive metal sculpture in the shape of a folded paper airplane overlooks a Utah mountain.

Eat burgers beneath gargantuan taxidermy and thousands of dollar bills in Utah's oldest continuously-operating bar.

In 1952, this restaurant began selling the Colonel's “secret” recipe.

Where unreadable addresses are read, 24 hours a day, seven days a week.

The only ski tunnel in North America provides easy access to amazing snow and beautiful views.

Step into the cool deep past and unknown future of who begat who.

These 100-year-old tunnels in downtown Provo house artists, restaurants, and a few surprises.

These headstones and a few stone foundations are all that remain of a once-booming mining town.

This lava formation earned its whimsical name from the log-like formation of it stones.

Dig for your own trilobites in this goldmine of invertebrates.

A shady solar power system that couldn't hold up to the harsh desert conditions.

A museum in rural Utah documents the history of the Japanese Americans who were forcibly relocated there.

Where a guard killed nine German prisoners during one of the worst 20th-century POW camp massacres in U.S. history.

This set of three large, volcanic hot springs is a favorite haunt for intrepid divers.