Pennington County Minnesota has 3 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Red River Trail: Goose Lake Swamp Section, Minneapolis St. Paul and Sault Ste. Marie Depot, Thief River Falls Public Library.
Some of the country's most noteable architects helped create the Pennington County places including Joseph C. Lutz, Maine, Maurice, et al. and William Kenyon. Prominent architectural styles found in Pennington Country are Bungalow/Craftsman.