Researchers believe Giorgio Vasari's fresco bearing the words "Cerca trova" (Seek and you shall find) painted on a wall in Florence, Italy, covers Leonardo da Vinci's lost painting titled "The Battle of Anghiari." (National Geographic via Associated Press)

Researchers believe Giorgio Vasari's fresco bearing the words "Cerca trova" (Seek and you shall find) painted on a wall in Florence, Italy, covers Leonardo da Vinci's lost painting titled "The Battle of Anghiari." (National Geographic via Associated Press)