Tom Crane/Pennsylvania Academy of the Fine Arts

By 1985, Warhol's style had evolved substantially; on this untitled headline piece, he collaborated with Keith Haring. National Gallery of Art hide caption

itoggle caption National Gallery of Art

Overgrazed Land. Pennington County, South Dakota (1936) is one of several photographs Arthur Rothstein took to document dry, sun-baked earth of the South Dakota Badlands. Arthur Rothstein/Library of Congress, Prints & Photographs Division, FSA/OWI Collection hide caption

itoggle caption Arthur Rothstein/Library of Congress, Prints & Photographs Division, FSA/OWI Collection

A model walks the runway at the Irina Shabayeva Spring 2012 fashion show during Mercedes-Benz Fashion Week at Audi Forum on September 14, 2011 in New York City. Neilson Barnard/Getty Images hide caption

itoggle caption Neilson Barnard/Getty Images