>>212409926depends on your intentions, the big 3 (moscow, sbp, kazan) if you don't plan to go beyond ural and siberia, if you do, then add novosibirsk and ekaterinburg. most of the museums are in moscow and s.petersburg.
if you're into nature and shit, unfortunately our tourism industry for that sucks ass, karelia is basically finland but dirt poor and grim, lake baikal is beautiful, but in the middle of nowhere, caucasus is basically just your average chile mountains, but with annoying people.