A picture taken on October 24, 2015 shows the arch of Bab el-Bhar ("Gate of the Sea"), one of the gates of the Medina of Tunis, illuminated in blue light as part of the 'Turn the World UN Blue' Campaign to celebrate the 70th anniversary of the United Nations. AFP PHOTO / FETHI BELAID        (Photo credit should read FETHI BELAID/AFP/Getty Images)