People arrive to visit the pavilion Zero of the UN at the Universal Exposition, EXPO2015, in Milan. The opening of EXPO2O15 was marred on May 1 by violent clashes between police and dozens of militants opposed to Milan's hosting of the world fair. Thousands of visitors poured into the specially created Expo site on the edge of Milan. After months of concern about delays, partly linked to a corruption scandal that hit the organisation last year, it appeared most of the key construction work for the Expo had been finished in the nick of time. AFP PHOTO / OLIVIER MORIN