It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
This image was acquired from
Keywords from Image Description:
Detail venetian fortress harbour Heraklion. en Detail of the venetian fort Kouls at Heraklion harbour Crete Greece fr Dtail du fort de Kouls dans le port vnitien d'Hraklion Crte Grce own Jebulon other versions cczero Uploaded with Heraklion fort Lion of Saint Mark in heraldry of Venice Quality images by Jebulon
Page 2017 Free-images.com. All images are Public Domain