One of my favorite things to do in Russia is visit the Orthdox Churches. They are beyond beautiful. I have not been to this Church (and I would have to say this is not one of the prettiest that I've seen but it was the best i could find on google). This is a typical setting with the Icons in the front and alter areas. This picture does not give Orthodox Churches any justice. It is something you have to see in order to really capture the beauty. The services consist of a choir useally singing and the pastor carrying around an object that lets off incense. The sound, sights, and smell make it an amazing spiritual experience.
I dont really know what goes on during the service but the people useaully walk around and kiss icons, say prayers, and light candles. They are very strict about the way you carry yourself, for example women must wear coverings over their heads, men cannot wear hats, and nobody is allowed to have their hands in their pockets. If you break one of these rules watch out for the babushki! But overall the Russian Orthodox Church is a definite must see if you ever have the chance to go to Russia.