In the Harry Potter movies, we see long shots of Hogwarts castle, having tall spires, perched on a steep rocky hill above a lake. Were these shots taken of a real castle actually built in such a setting, or are they all effects shots? If they are of a real castle, what does the real castle look like (just as shot, or embellished)? I know that some shots appear to take things to a bit of an extreme, and could be impossible to engineer, but when you consider Neuschwanstein, how it was designed and where it was built, one could easily imagine that a castle looking very like Hogwarts could actually exist, and in just such a setting as depicted.
I know some exteriors like Harry's flying lesson were actually shot at Alnick Castle, but Alnick is a very different-looking castle situated in very different topography. I'm referring to the long shots which show the castle in its rather spectacular location.