Foto: "<a href="https://ccby.de/foto/golubac-fortress-at-the-danube-river/1028332" target="_blank">Golubac Fortress at the Danube River</a>" von <a href="https://ccby.de/fotograf/marco-verch" target="_blank">Marco Verch</a> via <a href="https://ccby.de" target="_blank">ccby.de</a>, <a href="https://creativecommons.org/licenses/by/2.0/de/" target="_blank">CC-BY 2.0</a>