Pope Francis waves at the crowd from the popemobile on his way to take a helicopter to Ecatepec --a rough, crime-plagued Mexico City suburb-- where he will celebrate an open-air mass, in Mexico City on February 14, 2016. Pope Francis has chosen to visit some of Mexico's most troubled regions during his five-day trip to the world's second most populous Catholic country.    AFP PHOTO / DIANA ULLOA / AFP / DIANA ULLOA        (Photo credit should read DIANA ULLOA/AFP/Getty Images)