Originally Posted by **********

Impossible to tell now... chances are they shot some of it in real locations, and some on stages. But even shooting at real locations, they would still use CG to edit or alter the scene and or to fill in the background, change things around, etc.

If you like to know how that kind of thing works, try going to Youtube and lookup "VFX Breakdown" for any movie. Usually you find cool ones like these

Which show you in a really fast and detailed way, all of the layers and CG they put into every scene.