Forced perspective

Tarkovsky's "Nostalghia" has an amazing example of 'forced perspective' in film making. Looking at the first image, there's a farmhouse behind the actor. As he pans back you see the whole scene framed in the enormous columns and facade of a destroyed church. He achieved this by making the farmhouse in miniature and very close to the actors. Click on the pics to enlarge.

Casablanca's last scene has a painted plane on a canvas, obscured by heavy artificial rain, and little people to simulate a large aircraft on an airfield. You'll never see that film again the same way.