Library of Congress
Loc: America's First Look Into the Camera (Daguerreotypes)
A searchable database from the Library of Congress that provides a fascinating look into the history of photography from 1839-1864. There are images from the Matthew Brady Studio and studio portraits by black photographers James P. Ball...
Smithsonian Institution
National Portrait Gallery: Civil War@smithsonian
Access to the Smithsonian's extensive collections that document the American Civil War.