[tzs]

Plus many shows only have interior shots, with maybe an occasional establishing shot. Worst case they might have to send someone to where the show is set to film the establishing shots, which is likely a one time thing. Everything else can be filmed anywhere.

A good example was "Frasier". I don't think it even had establishing shots, so all we saw was interiors [1]. Even those of us who lived in Seattle when it was on couldn't tell it was filmed in Vancouver.

[1] Except for one episode where they did have significant outdoor action set at various well known Seattle locations, which they did come to Seattle to shoot.

[asdff]

They can build a replica of any part of the world in not much time at all in a back lot in Burbank.