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 thirty-seven National Historic Landmarks (NHLs) in Alabama, which are located in eighteen of the state's sixty-seven counties. Five of the NHLs in the state have military significance, eight are significant examples of a particular architectural style, six are archaeological sites, six played a role in the African American struggle for civil rights, and five are associated with the development of the U.S. Space Program.