Francis Bacon's masterpiece painting, "Triptych 1976" (TRIP tik 1976,) which could fetch $70 million when it's auctioned by Sotheby's on May 14. The large three-panel work is full of symbolism and draws on ancient Greek mythology. It was purchased in 1977 from the Galerie Claude Bernard in Paris and has been shown in the Tate Gallery in London and the Georges Pompidou Centre in Paris. (AP Photo/Sotheby's)