Due to a potential legal loophole, it may be impossible to convict people of any crime that happens within a 50-square mile area around the Idaho parts of Yellowstone Park. This is due to how trial laws are written in that an accused culprit has the right to be tried by a jury from the district and state in which they're arrested. Since there's a population of zero in this small area of Idaho that's in the legal jurisdiction of a district in Wyoming, the trial may have to be forfeited.
In Idaho law forbids a citizen to give another citizen a box of candy that weighs more than 50 pounds.
Hell's Canyon is the deepest gorge in America.
Soda Springs boasts the largest man-made geyser in the world.