The Hall of the 500 in Florence's Palazzo Vecchio (Salone dei Cinquecento) is a large chamber containing a number of important artworks. It is understood to be the home of a possible lost Da Vinci painting, as he was commissioned to create a wall-sized battle scene. This model served as a contextual map upon which to plan various thermography and endoscopy experiments, in the attempt to locate the missing Da Vinci. These efforts are described in the 2010 National Geographic Documentary  Secrets of Florence" episode 2."