While we're between seasons of Game of Thrones a VFX studio that works on the show has kindly released a video showing its efforts, to keep us entertained.
The VFX showreel, from Macklevision VFX, shows what the world looks like before and after VFX are added in. Even the video is made in a cool way that quite literally drops the virtual backgrounds in as the scene plays out.
The huge wide shots of cities are utterly ridiculous, we don't even want to think about how long they take. Mainly because we don't want to imagine the next series taking too long to arrive.