Say a prayer, bow your head and perhaps even light a candle in Kazan Cathedral. This important place of worship may not always be open, so check ahead for times if you'd like to see inside.
When you've spent a bit of time at this Volgograd principal church, why not make your way to Mamayev Hill, Pavlov's House, and Flour Mill Ruins? They're near Kazan Cathedral and also a hit with many tourists.