Another site near where we will be staying in the second half of the semester is the Sakip Sabnci Museum. Among their collections is a calligraphy collection, which I'm pretty sure that I will HAVE to see at some point. It includes a number of illuminated Quran manuscripts.
Click here for information on the museum.
Also, for some information on the importance of calligraphy in Islamic art check out this discussion from the Metropolitan Museum of Art.