"Madonna of the Yarnwinder," believed
/"Madonna of the Yarnwinder," believed to have been painted in the first decade of the 16th century, was taken from Drumlanrig castle in southern Scotland at around 6 a.m. EDT. CNN.com - Da Vinci theft at Scottish castle - Aug. 27, 2003
As the article points out, how would you ever sell it? And I hope the person in charge of security for the exhibit has been sacked.