Not very many at all.
Real Madrid Vs Barcelona (November 2015)
Getafe vs Rayo Vallencano (November 2015)
Barcelona vs Roma (November 2015)
I suppose that's the bad thing about using your holidays mainly in Summer. I've been on a plane multiple times in my life but only twice in winter (the above games + Leipzig away)
what did you think of Getafe? I thought it was a great wee ground, went to see them v Sociadad 2 seasons ago, picked up tickets for behind the goal and after 20 mins the place was 2/3s empty so we wandered round to the half way line (unchallenged) and just walked up the stairs and sat in the 50 euro seats
we were in Madrid for the Atletico v Leverkusen CL gave and realized the day before on the Monday that Getafe was just up the road, great wee bonus
Went to Mexico around '76/'77 and watched Club America v Guadalajara at the Azteca. This was their equivalent of our famous rivalry only 100,000 in attendance. Mental atmosphere.
Also been to BMO Field in Toronto and Tampa Stadium.