Finding The Lost Da Vinci

A tourist photographs of a reproduction of Leonardo da Vinci's "La Battaglia di Anghiari" (The Battle of Anghiari) at the Palazzo Vecchio in Florence, Nov. 30, 2011. Researchers may have discovered traces of the lost mural by poking a probe through cracks in a 16th century fresco painted on the wall of one of Florence's most famous buildings. (Laura Lezza/Getty Images)