This is a must see if you are coming to Pittsburgh for the first time.
You get a chance to see Gothic architecture from the ground up. On the third floor is a view of the Gothic ceilings...amazing.
Each of the classrooms (actually, small "seminar" rooms) is decorated according to the culture it represents. I was especially drawn to the German, Polish, and African rooms.
It was a hot day and not all the rooms are air conditioned so factor that in when you go. (also, no food or drink is allowed.)
There are recorded messages in most rooms that told about the history behind each of the designs.
Nothing else like it.