Religious History Museum of the USSR Academy of sciences (ex. Kazan Cathedral. 1801-1811. Former Kazan Cathedral is one of the best monuments of Leningrad. Despite its brutality it strikes as slim and light. The transparent forest of fluted columns is particularly impressive. Powerful half-rounded column ensemble creates an organized square and links it to the environment. Voronikhin A.N. 1760-1814. Leningrad.