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"Portrait of Joseph Roulin" by Vincent van Gogh, $58 million plus exchange of 4 paintings by Monet, Renoir, Kandinsky and Picasso.

Pricey Pictures

"The Scream", the iconic painting by the Norwegian artist Edvard Munch, will be auctioned at Sotheby's Impressionist and Modern Art sale tonight. It is expected to be sold for as much as $80 million, which would make it one of the most expensive paintings ever sold at auction. Here's a look at some of the world's costliest paintings. (sources: Christies; Sotheby's; Business Insider; New York Times; The Independent; Forbes; BBC; About.com.)