Thank you but your comment on my language made me regret for the time I lost in my younger days to learn English better than now. Just fine is not satisfactory for me.
Historical sites.. of course, but for me lots of differences altogether in Iran is more interesting.
Different languages (Persian, Azerbaijani Turkish, Arabic, Kurdish) and very many other accents that I can't even understand them when they speak.
Different races (Fars, Turk,Kurd, Arab,Lor, Turkmen, Baluch, Tabari...)
Different landscapes from hottest deserts of the world to dense jungles and to places where you can find snow even in the summer.
Different skin colors from blacks to blonde white people, all of them native.