Millions of tourists visit Red Square in Moscow each year to see the historic sights at the heart of the city. These include the Kremlin and St. Basil's Cathedral, masterpieces of ancient Russian architecture featuring old cathedrals, the Tzar Cannon, and Tzar Bell. St. Basil's Cathedral was built in the mid-16th century to commemorate a victory, and there is a legend that Ivan the Terrible blinded its architects to prevent another architectural triumph.