Pont du Gard, Roman aqueduct, Nîmes, France: the River Gard is seen in the foreground. Photograph by Neurdein Frères.

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Pont du Gard, Roman aqueduct, Nîmes, France: the River Gard is seen in the foreground. Photograph by Neurdein Frères. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.