Article Photos: Lincoln fans have lots to see, do in Washington, D.C. 3/4

This undated image provided by the Smithsonian’s National Museum of American History shows Mary Todd Lincoln's purple velvet gown from “The First Ladies” exhibit. The gown was made by her seamstress and confidante, Elizabeth Keckley, an African-American woman who had purchased her own freedom. It’s one a number of artifacts associated with President Lincoln and his family in the Smithsonian collection. (AP Photo/Smithsonian’s National Museum of American History)