Start your day by visiting the iconic Red Square, the heart of Moscow. Admire the colorful St. Basil's Cathedral and take a stroll around the square. Then, head to the Kremlin, a historic fortress that houses several museums and cathedrals. Don't miss the Armory Chamber, which displays the treasures of the Russian tsars. End your day with a visit to the Bolshoi Theatre, one of the world's most famous opera and ballet venues.