Что находилось в Исаакиевском соборе во время СССР?
Saint Isaac's Cathedral or Isaakievskiy Sobor () in Saint Petersburg, it is the largest church in Russia. It is the second largest Orthodox church in the world by area and also the second in the world by volume. It is dedicated to Saint Isaac of Dalmatia, a patron saint of Peter the Great, who had been born on the feast day of that saint.
Saint Isaac of Dalmatia