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:
Bremen Merian Pulvertrme. Thirty Years' War adaption powder towers mphasized by red colour The eastern one on the right had already exploded in but been rebuilt in collapse of the southern cathedral tower other date explosion of powder magazine Stephanitorzwinger copper engraving Cityview Cuts File BremenMerian cutout Ansgarii