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

Licence: Public Domain Mark

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