I walked around Moscow for a day, shielding my eyes from what, in my opinion, is the most beautiful building in the world, St. Basil's Cathedral in Moscow. I didn't want to see even a glimpse of it out of the corner of my eye until I could enjoy all of its beauty and charm. Truth be told, I cried the morning we finally went to Red Square. St. Basil's Cathedral is frankly hard to miss, just step into Red Square and you will be overwhelmed by this 16th Century masterpiece.