Yeah, I tend to find Catherine Palace, Winter Palace, Gatchinaand Peterhof are the most well known of St.Petersburg's palace, and when I mention Alexander Palace, I find that I have to explain where it is, because it's not the most well known of the palaces. Whenever i look in books about Russia (i.e. the travel books) I find there are huge sections about the other palaces and a small bit about AP.