The National Historic Landmarks in Alabama represent Alabama's history from the precolonial era, through the Civil War, the Civil Rights Movement, and the Space Age. There are 39 National Historic Landmarks (NHLs) in Alabama, which are located in 18 of the state's 67 counties. Five of the NHLs in the state have military significance, eight are significant examples of a particular architectural style, six are archaeological sites, seven played a role in the African American struggle for civil rights, and five are associated with the development of the U.S. Space Program. One site in Alabama was designated an NHL, but the designation was subsequently removed.