POMPEI, ITALY - APRIL 12:  Tourists look at their maps as they visit the archaeological site on April 12, 2014 in Pompei, Italy.  The Italian government has enacted a series of provisions for the strengthening of the private security inside the archaeological site, following the recent theft of part of the fresco of Artemis. In 2013 Pompeii was visited by almost 2.5 million tourists.  (Photo by Giorgio Cosulich/Getty Images)