If you ever go to Russia - and in particular, to St.petersburg - you definitely will have no time for it.... after having a boat trip across the channels, visiting the Hermitage museum, the Russian museum, a few Palaces - Yusupov's Duke to name at least one (where Rasputin was killed), and ofc there is also Peterhoff -- the Summer residence of Russian Emperors (knowas as the Russian Versaille), and the Letnii Sad (Summer Garden), and beautiful city districts, old streets consisting completely of old buidings of XIX century.... so much will be on your list - with not so much time :P

ps. I just re-steemed my old post from 2019 - same location but different (fish-eye) lens.