The author of this image from Switzerland is unknown, and the image was published at least 70 years ago. It is therefore in the public domain in Switzerland by virtue of Art. 31 of the Swiss Copyright Act.
Note that this applies only if a reliable source is cited to indicate that the author is not publicly known; just not knowing who the author is is not enough to qualify the image as public domain. This image may not be in the public domain in countries other than Switzerland.
Esta es una imagen retocada, lo que significa que ha sido alterada digitalmente de su versión original. Modificaciones: denoising and manual dust removal, contrast adjustment, cropped to standard aspect ratio, rescaled, sharpened, and converted to JPEG.
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Augustusbrücke und Dresdener Altstadt im Jahr 1668