Linn County Kansas has 8 places on the National Register of Historic Places including 1 place of National significance and 3 places of Statewide significance. Significant places include Marais des Cygnes Massacre Site, Battle of Mine Creek Site, Landers Creek Bridge and Mine Creek Bridge and Linn County Courthouse.
Some of the country's most noteable architects helped create the Linn County places including James Barney Marsh, Ray Gamble, Ezekial Bunn and George Ropes. Prominent architectural styles found in Linn Country are Early Commercial, Italianate and Renaissance.