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

In 1992, Lesage started an embroidery school to pass on to a new generation the techniques of an art form threatened by mass-produced fashion. Olivier Saillant/Maison Lesage hide caption

itoggle caption Olivier Saillant/Maison Lesage

Man Ray Portrait of Lee Miller - Flying Head, c. 1930 Paris Vintage gelatin silver print Lee Miller Archives hide caption

itoggle caption Lee Miller Archives

The right eye of Leonardo da Vinci's "Mona Lisa." On Aug. 21, 1911, the then-little-known painting was stolen from the wall of the Louvre in Paris. And a legend was born. Associated Press hide caption

itoggle caption Associated Press

The High Museum of Art commissioned nendo, a Japanese design collective, to create Visible Structures — a 12-piece installation of furniture made out of form core and cardboard, reinforced with graphite tape. Masayuki Hayashi hide caption

itoggle caption Masayuki Hayashi

Samuel F. B. Morse, Gallery of the Louvre, 1831–1833, oil on canvas. Click here to enlarge. Richard House/Terra Foundation for American Art, Daniel J. Terra Collection/Courtesy of the National Gallery of Art hide caption

itoggle caption Richard House/Terra Foundation for American Art, Daniel J. Terra Collection/Courtesy of the National Gallery of Art

A visitor looks at paintings at the Barnes Foundation in Lower Merion, Pa. The art collection is moving to a new building in downtown Philadelphia. Jessica Griffin/AP hide caption

itoggle caption Jessica Griffin/AP

The Cone sisters typically forged strong patron-artist relationships, but they were particularly close with Henri Matisse. While working on Large Reclining Nude, Matisse sent 22 photographs of the work in progress to Etta Cone. The Baltimore Museum of Art hide caption

itoggle caption The Baltimore Museum of Art

A self-portrait by Rembrandt, valued at $36 million, was taken from the Swedish National Museum in 2000. Robert Wittman, founder of the FBI's Art Crime Team, went undercover — as an authenticator for an Eastern European mob group — to recover it. Swedish National Museum hide caption

itoggle caption Swedish National Museum