This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Fort Crawford footings. en The first Fort Crawford was built by the Army at Prairie du Chien Wisconsin in Its vestiges lie just north of the Villa Louis The brown rectangles in midphoto are the footings of the north wall The blockhouse at upper right is reconstruction own Jeff the quiet United States Army Forts in Wisconsin War