Cars are set on fire by protesters during a rally against Expo 2015 in Milan
Cars are set on fire by protesters during a rally against Expo 2015 in Milan, Italy, May 1, 2015. Italy opens the Milan Expo on Friday, torn between hopes that the showcase of global culture and technology will cheer up a gloomy national mood and fears that it will be overshadowed by scandal, delays and street protests. REUTERS/Alessandro Bianchi TPX IMAGES OF THE DAY