Quoted: Elizabeth Gibson found a painting by Rufino Tamayo on the street four years ago. Said to be worth about $1 million, it is heading for the auction block next month.

This Klimt painting has a pretty fascinating history (as do many precious objects). Confiscated by the Nazis, the Austrian government and later bequeathed to Austria, the surviving family just sued Austria for possession - and won. Now they've sold the keystone piece to Lauder for $135 million.

Quoted: Cosmetics magnate Ronald S. Lauder paid the highest sum ever for a painting for Gustav Klimt's 1907 portrait "Adele Bloch-Bauer I."

I knew it! We made Mona Lisa smile!

Quoted: Millions of invisible dots lie behind the enigmatic smile of Leonardo da Vinci's famous painting.