[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2010/images/03/18/vermeer.concert.art.jpg caption=""The Concert" is one of only 35 known works by Dutch master Johannes Vermeer."] By Alina Cho, CNN (CNN) – It is the largest art heist in history. For 20 years, investigators have been chasing down hundreds of leads. They've interviewed countless witnesses all over the world, and still the central questions … Continue reading New details emerge in history's largest art heist