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.
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Shoshone Falls, Idaho, The Niagara of the West, spills over a 212-foot drop near Twin Falls.
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President Theodore Roosevelt established the Caribou National Forest in 1907. The area now covers more than 1 million acres in southeast Idaho.