This image was acquired from
flickr. 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:
hadrian's hadrians wall hadrians' wall national trail hadrianswallnationaltrail roman frontier limes northumberland central sector centralsector hwfeed blackandwhite monochrome black and white Woodcut by F.W. Fairholt showing the rockcut Vallum just east of the Knag Burn looking E. Scanned from the th edition of the Handbook to