Another remarkable building that is not quite so old (a mere ~1500 years) is the Hagia Sophia in Istanbul:
The smell thought, was super funky, I guess that is what carpets and 1000's of feets do :)
You will be missing out, Turkey is a super cool country, awesome food, super very proud people.
Haia Sofia is not even in the TOP 10 of my list of cool stuff to do in Istambul. I really hope to go back some day and spend a at least 2 weeks in the region next time.