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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At 5897 feet elevation, Mackay calls itself the Top of Idaho because it is the nearest city to Mt. Borah, the highest mountain in Idaho.
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Saint Stanislaus Church, in Rathdrum, is the oldest brick church in the state of Idaho.