Why do people love Spain so much?

I got weepy at the airport when I left after my first trip. I went back and lived there 13 years, very happily. I miss it now I'm in the US again. But I can't put my finger on just what it is that makes me, and apparently an awful lot of other people, love it so much.

Sometimes I think it's just that the dust settled in my bones. I also love the ever-present mountainous horizon and the big Spanish sky.

Any ideas?