Located next to the Saint-Sulpice Seminary and faces the Place d'Armes square, the Roman CatholicNotre-Dame Basilica was built between 1824 and 1829 after a plan of the Irish-American Anglican architect James O'Donnell, and on its completion was the largest in North America. The first tower was finished in 1841, and the second in 1843. Victor Bourgeau worked on interior from 1872 to 1879. Chapelle du Sacré-Cœur (Chapel of the Sacred Heart) was completed in 1888 built behind it, along with some offices and a sacristy.
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