A fantastic multi-media archive from the University of Virginia, relating to Uncle Tom's Cabin and its place in American culture across several decades. Includes a wealth of visual and textual primary sources, including African-American and Southern white responses to the novel.
A wonderful exploration of P.T. Barnum's "Lost Museum," with primary source documents.
The Barnum Museum in P.T.'s birthplace, Bridgeport Connecticut.
New York Public Library site on the performing arts, with original images of actor lithographs and playbills.
PBS's American Experience site on blackface minstrelsy.
Ethnic Notions (1986) is a fantastic documentary on the black image in the white mind; it includes depictions of African-Americans under slavery and long thereafter, with an extremely valuable analysis of blackface minstrelsy.