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1 of 6People gather outside of Notre Dame cathedral ahead of a ceremony in memory of the victims of the terrorist attacks in Paris on Nov. 15, 2015.David Ramos—Getty Images -
2 of 6The Archbishop of Paris, Andre Vingt-Trois says mass at the Notre Dame Cathedral in Paris on Nov. 15, 2015.Lionel Bonaventure—Reuters -
3 of 6Paris mayor Anne Hidalgo and Deputy-Mayor Bruno Julliard attend a ceremony in memory of the victims of the terrorist attacks at Notre Dame cathedral in Paris on Nov. 15, 2015.Lionel Bonaventure—AFP/Getty Images -
4 of 6Former French President Valery Giscard d'Estaing arrives to attend mass at the Notre Dame Cathedral in Paris on Nov. 15, 2015.Lionel Bonaventure—Reuters -
5 of 6Prelates arrive to celebrate a mass in homage to the victims of the Paris attacks at the Notre Dame cathedral in Paris on Nov. 15, 2015.Lionel Bonaventure—EPA -
6 of 6People gather outside for a national service for the victims of the terror attack at Notre Dame cathedral in Paris on Nov. 15, 2015.Daniel Ochoa de Olza—AP
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