A poster that reads in French, « Square of Liberty and expression » and one showing an image of the Enlightenment writer Voltaire are plastered on a tree at the Place de la Republique, on January 11, 2015 in Paris, prior to the start of a huge march which will end at the Place de la Nation. More than a million people and dozens of world leaders were expected to march through Paris in a historic display of global defiance against extremism after Islamist attacks in Paris last week that left 17 dead. AFP PHOTO/JOEL SAGET