I've been to Spain four times. I have relatives in Madrid. It is really a beautiful country. Every time we went, we visited different places and every time it was a beautiful experience.
In Madrid, we visited El Prado museum, among other places. Very beautiful museum, and so many important paintings!
One of the things I found curious was that one time my family and I were walking in Madrid and we approached a man who was passing by to ask for directions and he said that by the way we walked and moved, he could tell we were Argentinians

I thought it was funny.
I think the places I liked the most, besides Madrid, were Salamanca, Toledo and Seville.
Oh! and the weather is very nice too. We went three times in the summer (very, very hot) and one time in winter and we got to see snow!