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:
Maastricht Nieuwe Bossche Fronten kazemat of Dibbets Brabant ca . en Interior of Casemat or Dibbets in the northern fortifications of Maastricht Drawing by Jan Brabant Morreau Bolwerk der Nederlanden Assen Jan Brabant Custom marker PDold Views of Maastricht by Jan Brabant Maastricht in the Uploaded with Lage Fronten