Game Of Thrones

@BehindScenesPic/Twitter

If there are two things in the Game of Thrones series that absolutely require a green screen, it's the dragons and the wall. Thanks to HBO's big budget, we got to watch Jon and the Wildlings climb the wall in season three.

It looks like they actually used a vertical wall for the scene, but the ground was probably only 30, not 300, feet below.