The Smithsonian Photography Initiative is devoted to the presentation and study of photographic images, viewing photography as an art form, a record keeper, and a cross-disciplinary medium that encompasses science, history, popular culture, and more.
"This website includes 600,000 digitized images from some of the finest photojournalists, documenting past and present events in politics, culture, celebrities and the American experience. "
Photographers have been manipulating imagery since the medium was invented. Time magazine presents this online photo essay of what it calls the 'Top 10 Doctored Photos.'