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.
Wellenberg Innentreppe. Im Innern des Wellenbergs Zeichnung von Emil Schulthess Zentralbibliothek Zrich upload March Emil Schulthess upload by Adrian Michael PDold Emil Schulthess Wellenberg
Page 2023 Free-images.com. All images are Public Domain