Image credits

The city images on gppb.info are adaptations of freely licensed photos from Wikimedia Commons, rendered as hatched artwork. As adaptations they are released under the same license as the respective original photo.

• Bremen: Bremen-rathaus-dom-buergerschaft.jpg by Klaus Grünberg, CC BY-SA 3.0
• Hamburg: Hamburg view St. Nikolai.jpg by kallerna, CC BY-SA 4.0
• Hannover: Neues Rathaus Hannover 2013.jpg by Thomas Wolf, www.foto-tw.de, CC BY-SA 3.0 de