This hulking rock formation balances on a pedestal that is 3 feet by 17 inches.

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.

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

Home to a timed geyser created by complete accident.

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

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

An ordinary rancher stumbled upon one of the world’s largest collections of Pliocene horse fossils.

Home to the deepest rift anywhere on Earth.

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

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

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

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

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

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