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Worth a visit
If you visit the Kremlin in Moscow, and you want to see a fascinating show for free, I recommend the changing of the guard that takes place every hour at the tomb of the unknown soldier - the monument to the dead of World War II. It is very dramatic, particularly in winter, as the soldiers remove their jackets even when there are snowflakes the size of a fist falling in -20 degree weather. Very worth seeing, and as it takes place every hour, it's easy to coordinate your trip.