A 500-year-old da Vinci painting once belonged to a king who died on the chopping block. On Wednesday, it fetched a king's ransom -- on the auction block. It sold for $450 million late Wednesday. Six years ago, art collector Robert Simon made a discovery that would rock the art world. He bought and restored what he thought was a merely a copy of Renaissance master Leonardo da Vinci's long lost work, the "Salvator Mundi." He got it at a bargain, for $10,000. "My hope was that this could be an interesting version or copy by a student of Leonardo ...," Simon told CBS News, "... not by the master himself." But turns out, ... (full story)