Paris's Notre Dame Cathedral celebrates its 850th anniversary

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Reuters/Jacky Naegelen

Paris's Notre Dame Cathedral is celebrating its 850th anniversary. Hundreds of people from all over the world gathered last week for a ceremony and mass marking the beginning of year-long commemoration of the anniversary of the start of construction in 1163. Fourteen million people visit the cathedral every year. But not all churches in France have the same attraction. A look at the evolution of French Catholicism.