During World War II, over 13,000 people of Japanese ancestry were forcibly removed from their homes and incarcerated in this camp in the Idaho desert.

A lava tube cooled to form this long tunnel that stays chilly even at the height of summer.

Cross the Continental Divide through an old railroad tunnel, and ride back to the top on a shuttle.

Two geologically young and nearly circular volcanic subsidence craters, each about a half-mile in diameter, abruptly break the nearly featureless Snake River Plain.

This U.S. natural reserve is an ancient spiritual place and rock climber’s paradise.

A former sanitarium where soldiers were sent to recover in the healing waters of hot springs.

The only bridge in the United States where BASE jumping is legal without a permit year-round.

This giant tower beacon was a key navigation tool for pilots delivering mail amid the night skies.

One of the "twins" in these falls on the Snake River was sacrificed for hydropower generation in the 1930s.

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

Where the famed daredevil attempted to launch himself across a canyon in a custom-built rocket.

A creek tumbles over a series of step-like rocks to create this scenic water feature.

An Idaho legend carved out a cave village with his own two hands.

Home to a timed geyser created by complete accident.

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

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

This set of hot springs also comes with fantastic views.

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

A legal loophole makes it possible to get away with murder within this 50-square-mile section of Yellowstone.

See just what life was like in a 19th-century prospecting town.

Home to the deepest rift anywhere on Earth.

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