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

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

New Plymouth, Idaho is the only U-shaped town in the United States.

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

This historic Idaho island is home to a strange timeshare museum, a homemade mini-golf course, and an outhouse named Aunt Fanny.

Supposedly Satanic numbers adorn this preserved submarine sail.

The secluded site of a 1943 plane crash and amazing rescue is only accessible by hiking through the woods.

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

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

After this former brothel closed, its interior remained almost frozen in time.

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

The mayor made the declaration in 2004.

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

This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

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

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.

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

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

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

A desert settlement founded and later abandoned by Hawaiian members of the Church of Jesus Christ of Latter-day Saints in Utah's Skull Valley.

Local lore holds that Butch Cassidy took an escape route through Red Canyon's sandstone hoodoos after an attempted murder.

A ghost town that held steady longer than most, but finally gave up the ghost.

An Ancestral Puebloan ruin that appears to burst into flames in the sunlight.