Britain Rockefeller Collection

Christie's London auction house staff pose for photographs with Claude Monet's "Nympheas en fleur," which will feature in the upcoming New York sale of the collection of Peggy and David Rockefeller this May. Hanging at the Rockefellers' premises in London, the Monet is estimated to fetch $50 million to $70 million. The art collection amassed by billionaire David Rockefeller could raise more than $500 million for charity when it is auctioned this spring. (AP Photo/Matt Dunham)