There are so many beautiful cathedrals scattered throughout this city. As you are around the city you can see tops of cathedrals. The trick is to look for the domed tops! When you see one, go and have a look. And if you can, step inside. The inside of these cathedrals are even more beautiful on than the outside. The one I went in was dark and there were some people inside. A choir was singing and candles were lit in memory of loved ones. It was very spiritual for me to step inside. Just be courteous and if possible cover your head with a shawl. If you do not have one, do not worry, you can still step inside for a look, many times no one will say anything to you about it.
Many times these cathedrals are simply a way of life for the Russian people. Some of the most interesting cathedrals I saw, the people I was with would say, "Ah, It is nothing, just a church!" However when I looked at it I thought, "WOW, what a work of art."
Looking at these cathedrals may not be a very planned activity, but more of a "hobby" to do while you are spending time in the city. If you are with Saratovites ask them what the cathedrals meaning is, and why it was built. Many have interesting stories.