Portrait of an Unidentified Soldier Taken by Welsh Photographer Calvert Richard Jones (1840's)

Portrait of an unidentified soldier by Welsh photographer Calvert Richard Jones, c. 1845-1850.

Source: Metropolitan Museum of Art.

Stereoview Scene of a Soldier Leaving His Family, European (1860′s/1870′s)

Stereoview scene of a soldier leaving his family, European, c. 1860′s/1870′s.

Source: Rijksmuseum.

Carte De Visite Portrait of an Unidentified Man Believed to Be a Dutch Sailor Taken in the Hague, Netherlands (1870's/1880's)

Carte de visite portrait of an unidentified man believed to be a Dutch sailor taken in the Hague, Netherlands, c. 1879-1883. By Adolphe Zimmermans.

Source: Rijksmuseum.

Portrait of an Unidentified United States Capitol Police Officer by C.M. Bell of Washington, D.C. (1800′s)

Portrait of an unidentified United States Capitol Police officer by C.M. Bell of Washington, D.C., c. 1800′s.

Source: Library of Congress.