as everyone other said, too many to mention.....
anyway, my fav scenes are the Sicilian ones. I love the way Michael's return to his roots is portrayed. The way Sicily's melting beauty is portrayed in that reddish/golden light. Keep your breath and when the magic Rota's music stops, you can smell the orange blossom and hear the crickets cry. The way an ancient, savage yet pure world melts with a new one when Micheal and Apollonia share looks. The return to one's mother's womb to taste a too short moment of perfect happiness. Then the car explosion. Revenge, blood, death, revenge. Michael's destiny is traced.
So powerful.