Aerial photograph of Montfort castle in Langenargen
Hans Krebs
CC BY-SA 4.0
ETH-Bibliothek Zürich, Bildarchiv / Fotograf: Krebs, Hans / Com_FC-D000-7994-008 / CC BY-SA 4.0 / <a rel="nofollow" class="external free" href="https://doi.org/10.3932/ethz-a-000022633">http://doi.org/10.3932/ethz-a-000022633</a>