Under the dome of St Paul's Cathedral is located three galleries : outdoor stone exterior and golden galleries, as well as
internal whispering gallery . Last Gallery , located at an altitude of 259 degrees , owes its name to its acoustic features , the words spoken in a whisper at this gallery , return echo from the opposite wall.
In the belfry of St. Paul's Cathedral are 17 bells , 4 of them - in the south- west tower and 13 - in the north -west .