Mary, Queen of the World Cathedral (originally called St. James Cathedral) was patterned after Saint Peter’s Basilica in Rome yet is one-fourth the size. The Roman Catholic minor basilica was finished in 1894 and reconstructed in 2005. The interior is richly adorned and gorgeous. The cupola above the altar is the crowning achievement. The transepts are decorated with paintings depicting key events in Montreal’s history. Admission is free.