Fun facts about this northwestern state: In Idaho law forbids a citizen to give another citizen a box of candy that weighs more than 50 pounds. President Theodore Roosevelt established the Caribou National Forest in 1907. The area now covers more than 1 million acres in southeast Idaho. Idaho’s first territorial prison was opened in 1872. It was placed on the National Register of Historic Places. It was converted into a public facility after the last prisoners were removed in 1974.