Saint Petersburg is a large Russian city located on several islands on the Gulf of Finland. The biggest sacred building in St. Petersburg is Saint Isaac's Cathedral with a gilded dome. The temple was erected on the initiative of Tsar Alexander I Pavlovich and its construction ended in 1858. Interestingly, after the October Revolution, the cathedral served as a museum of atheism for some time. Currently, the temple is willingly visited by tourists, also because of the vantage point located on its top. On the square in front of the Cathedral there is an equestrian statue of Nicholas I.