In case you ever wondered what’s the oldest known photo of a human being:

Boulevard du TempleParis, IIIe arrondissement, Daguerreotype. The first picture of a person. The image shows a busy street, but because exposure time was over ten minutes, the traffic was moving too much to appear. The exception is the man at the bottom left, who stood still getting his boots polished long enough to show. Note that the image is a mirror image.