Kazan Cathedral, also known as the Cathedral of Our Lady of Kazan is one of the largest cathedrals in St. Petersburg and is modeled on St. Peter’s Basilica in Rome. After Napoleon’s retreat from Russia, the cathedral became something of a memorial to this Russian victory over the French. Post-revolution, the church was turned into the Museum of the History of Religion and Atheism, an openly anti-religious exhibition space. It was returned to the Russian Orthodox Church in 1996 and today functions as the mother cathedral of St. Petersburg.