Grant County South Dakota has 15 places on the National Register of Historic Places including 1 place of National significance and 2 places of Statewide significance. Significant places include Hollands Grist Mill, Brown Earth Presbyterian Church and First National Bank of Milbank, Big Stone City Hall and First Congregational Church of Milbank.
Some of the country's most noteable architects helped create the Grant County places including Henry Hollands, James P. Niblo, C.E. Bell, E.R. Bogardus, Erick Schold and Fred Lippert. Prominent architectural styles found in Grant Country are Classical Revival, Gothic and Queen Anne.