Modeled after St. Peter's Basilica in Rome in 1801-1811, the Kazan Cathedral has a beautiful, rounded archway around the park-like plaza, yet has a hidden cross-shaped interior. This is a again a working cathedral, with crowds lined up inside to venerate the Kazan Icon of the Mother of God, and dozens of votive candles blazing away. No photos were allowed inside. Air pollution and age have pitted and darkened the outer facade.
After 1932 this cathedral was closed and transformed into the Museum of Religion and Athiesm. Perestroika led to the return of this and other cathedrals to the St. Petersburg Diocese of the Russian Orthodox Church.