As so much has been written about it already there is nothing which this blog can add, so just enjoy the postcards, all from the same city over a 100 year period.
The first card is from 1911 when the city was still known as Saint Petersburg.
The next is still pre revolution, but from circa 1915 after the city had been named Petrograd.
Still known as Petrograd, this card was sent in December 1917, shortly after the revolution. The card below that is from a pack celebrating the 50th anniversary of the October Revolution and by this time the residents lived in Leningrad. The final card is from the early 21st century with a return to Saint Petersburg.