Photograph of St Isaac's Square in St Petersburg. The photograph was taken from a high vantage point and shows the equestrian monument to Nicholas I in the centre of the square. Behind the monument is the three storey neo-classical Mariinsky Palace. Carriages and pedestrians are moving around the square. The rooftops of the city can be seen behind the Mariinsky Palace, with the domes of the Trinity Cathedral visible to the right. St Isaac's Square contains a number of the most impressive buildings in St Petersburg, including St Isaac's Cathedral and the Mariinsky Palace.