This is one of Kazan's symbols set on the other side of Kazanka river.
It's a huge structure of a cauldron, representing the Kazan name in Slavic languages, as a mixture of people and religions.
During our visit there were no weddings other travelers wrote about, in fact we were the only visitors there.
It was strange for me that in such obviously expensive edifice they didn't install an elevator for the top viewing platform. More strangely, you access the platform using stairs at the side entrance which look like an emergency exit.
Once up, there's a small desk with a lady collecting the symbolic entrance fee and a coffee machine - again strange. Imo, it'd be much more convenient to have an elevator and a coffee/snack bar up, which would attract more people and collect more income than around a dollar entry fee.
Views are really great - 360', but that's it - you have nothing else to do there, so it becomes a 5 min stop after an exhausting climb.