Expert Mauricio Seracini in the hall of the Five-Hundred (Cinquecento) at Palazzo Vecchio; Florence;Italy.Seracini says he is on the verge of discovering a long-lost Leonardo da Vinci masterpiece ' The Battle of Anghiari ' hidden in a secret cavity behind a wall of Palazzo Vecchio in Florence; Italy. October 30;2009. Seracini in the Palazzo Vecchio's grand ceremonial chamber; the Hall of 500; in front of Vasari's fresco 'The Battle of Marciano'. Leonardo's ' The Battle of Anghiari ' should be hidden behind this fresco. Photo by Eric Vandeville/akg-images