The thing about Russia (as well as other Russian speaking countries is that there is sooooooooooooo much to see, so large!) it's hard to even know where to start. Same dilemma, I think, as the USA but even more, since Russia has more historical/cultural sites.
Yes, they are rather scattered.

Had seen the "Ivan Vasilevich film - lol, I thought it was filmed in Moscow....
Modern scenes were filmed in Moscow, while medieval scenes were filmed in Rostov. Apparently, Rostov looked more like old Moscow