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:
Drachenfels Stich. Engraving by Matthus Merian shows Drachenfels Siebengebirge near Knigswinter North RhineWestphalia Kupferstich von Matthus Merian zeigt den Drachenfels mit noch unzerstrter Burg nahe Knigswinter NordrheinWestfalen Topographia Germaniae possibly Edition Topographia Archiepiscopatuum Moguntinensis Treuirensis et