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.
KalkkaserneAk. Ansichtskarte mit Offizierskasino KlnKalk ebayfund before unknown author PDold Postcards of Cologne Cologne in the KlnKalk Officers' messes
Page 2023 Free-images.com. All images are Public Domain