Daguerreotype Portrait of an Unidentified Man by Ball and Thomas of Cincinnati, Ohio (1840's/1850's)

Daguerreotype portrait of an unidentified man by Ball and Thomas of Cincinnati, Ohio, c. 1840's/1850's.

Source: Library of Congress.

Portrait of Two Unidentified Men Taken By the Slee Brothers of Poughkeepsie, New York (1800′s)

Portrait of two unidentified men taken by the Slee brothers of Poughkeepsie, New York, c. 1800′s. Possibly a double exposure of one man.

Source: New York Public Library.

Stereoview of Two People Posing in Front of the Smithsonian Institution Building in Washington, D.C. (1859)

Stereoview of two people posing in front of the Smithsonian Institution Building in Washington, D.C., 1859. By the London Stereoscopic Company.

Source: Library of Congress.

Portrait of an Unidentified Union Officer During the American Civil War (1860′s)

Portrait of an unidentified Union officer during the American Civil War, c. 1860′s. Attributed to Mathew Brady.

Source: National Archives and Records Administration.

Daguerreotype Portrait of an Unidentified Young Man by African American Photographer Francis Grice (1850′s)

Daguerreotype portrait of an unidentified young man by African American photographer Francis Grice, c. 1850′s.

Source: Library of Congress.

Animated Stereoscopic Portrait of an Unidentified Union Officer During the American Civil War (1860's)

Animated stereoscopic portrait of an unidentified Union officer during the American Civil War, c. 1860's. Attributed to Mathew Brady.

Source: National Archives and Records Administration.

Portrait of an Unidentified Union Officer During the American Civil War (1860′s)

Portrait of an unidentified Union officer during the American Civil War, c. 1860′s. Attributed to Mathew Brady.

Source: National Archives and Records Administration.

French Stereoview Scene Titled “Coll.6. - Le Deshabille De La Parisienne” (1800′s)

French stereoview scene titled “Coll.6. - Le Deshabille de la Parisienne,” c. 1800′s. Attributed to JB.

Source: Rijksmuseum.

Hand-Colored Animated Stereoview Portrait of an Unidentified Woman Wearing a Costume By German Photographer Moser Senior (1870's)

Hand-colored animated stereoview portrait of an unidentified woman wearing a costume by German photographer Moser Senior, c. 1870's.

Source: Rijksmuseum.

French Soldier Raoul Berthelé Playing With His Dog Named Goli in Berzy-le-Sec, France (1915)

French soldier Raoul Berthelé playing with his dog named Goli in Berzy-le-Sec, France, 1915. Attributed to Raoul Berthelé.

Source: City Archives of Toulouse.