What country in Europe did you enjoy the most?

So I am very interested in the history of Southern Europe(feel like a nerd). So me and my family want to go somewhere in southern Europe but i can't decide which country. I would like to see either Spain, Italy, Greece or Turkey (Istanbul), because they all have lots of historic places like the Hagia Sofia in Turkey, all those temples in Greece in Italy, and the castles and mosques in Spain. I really can't decide, help!