Doing a project on Spain... Are these three sightseeing places good?

Didn't really know how to phrase the question well, but I wanted to pick three sightseeing places that were the major ones in Spain rather than pick three that aren't that important or that people usually don't consider the major ones.
What do you think of....
El Prado?
Granada?
Las Ventas Bullfighting?
Is there something major that I CANNOT miss when talking about sightseeing of Spain? I'm guessing out of the three, you would probably say Las Ventas Bullfighting isn't as important... But anyway, thanks in advance for your help! I really appreciate it!

I've been to spain, its been ten year but I loved it!~
The Prado museum is good and houses alot of famous paintings. I would recommend the "plaza de espana" in Seville too.
Also Toledo is incredible, it looks very medieval even in modern day. the sword/knife factory is really cool as well as the cathedral.

Regarding Granada, you need to be more specific and mention going to the Alhambra Palace in Granada. Its the biggest must see in Spain. As a town Granada is very pretty but not too thrilling.

Bullfighting is the national sport and something that would be good to mention. I did not get to see a bullfight because of limited time. A flemenco show would be another great suggestion. Some people are rather sensitive to the idea of bullfighting. If you want to appeal to a larger audience then flamenco would be a good idea.

I hope that helps, good luck with your project