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

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

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

An impressive waterfall nestled in the cliffs of Idaho's Snake River Canyon.

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

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

Tucked away on a scenic trail, a modest memorial honors one of the greatest writers of our time.

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

This landmark is a central figure in the Nez Perce origin story.

This highest peak in Idaho can only be reached by traversing a formation known as "Chicken-Out Ridge."

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

These century-old beehive-shaped kilns were built to produce charcoal for nearby mines.

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

This oddity shop contains everything from antique tools to a human skeleton.

This set of hot springs also comes with fantastic views.

It was once used as a classroom to teach mining skills to local high school students.

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

A wild west land agreement was etched right onto this historic Idaho stone.

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

A former gold rush boomtown has managed to stay in business for over 100 ramshackle years.

Despite his legacy of work in Spain, Cuba, and Florida, the larger-than-life writer's grave is a simple affair tucked in an Idaho cemetery.

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.

Natural rock water slides hidden in the remote forests of northern Idaho.