This is postmarked in 2013 with a two Russian stamps from the series: Historical Centre of Saint-Petersburg. One of them is of this palace.
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The Winter Palace in Saint Petersburg, Russia, was, from 1732 to 1917, the official residence of the Russian monarchs. The storming of the palace in 1917 as depicted in Soviet paintings and Eisenstein's 1927 film October became an iconic symbol of the Russian Revolution.
The palace was constructed on a monumental scale that was intended to reflect the might and power of Imperial Russia. The green-and-white palace has the shape of an elongated rectangle, and its principal façade is 250 m long and 100 ft (30 m) high. The Winter Palace has been calculated to contain 1,786 doors, 1,945 windows, 1,500 rooms and 117 staircases.