I received this postcard in Slavic countries & Rest of the world RR :) It shows the Winter Palace (Зимний Дворец) in Saint Petersburg.
I haven' t been to Saint Petersburg yet, although I have a really good friend there (and we spent the last 2 weeks travelling together in Poland, Germany and Ukraine). So, if I get a visa, I'll go there for sure :)
Here's some information about The Winter Palace:
Located between the Palace Embankment and the Palace Square, the Winter Palace or Zimniy Dvorets (Russian: Зимний дворец) in Saint Petersburg, Russia was built between 1754 and 1762 as the winter residence of the Russian tsars.
Designed by Bartolomeo Rastrelli, the Rococo-style, green-and-white palace has 1,786 doors and 1,945 windows. Catherine the Great was its first imperial occupant.
The Palace is now part of a complex of buildings known as the State Hermitage Museum, which holds one of the world's greatest collections of art. As part of the Museum, many of the Winter Palace's 1,057 halls and rooms are open to the public. The Military Gallery, opened in 1826, accommodates 332 portraits of military leaders of the Russian army during Napoleon's invasion of Russia.
After the February Revolution in Russia, the Winter Palace was the headquarters of the Russian Provisional Government.
The assault of the Winter Palace by Bolshevik forces was the official milestone of the October Revolution.