Darren Aronofsky dreams big. This pic he recently tweeted of the arc he's building for his upcoming epic, Noah, came with a personal message: "I dreamt about this since I was 13. And now it's a reality. Genesis 6:14." What drives modern directors to pursue their expansive, expensive creations with the passion of Biblical visionaries? Who knows—maybe they do it just because they can. We decided to look into this crazy, world-building ambition by finding the following 8 colossal movie props and sets, all of which have been described at some point as "the largest ever." Start craning your necks…now.