We found 2 Reddit comments about Pittsburgh Then and Now (Then & Now). Here are the top ones, ranked by their Reddit score.
We have this one at our coffee table: http://www.amazon.com/gp/aw/d/1592231411?pc_redir=1406971552&amp;robot_redir=1
It's a very well done then and now book, love flipping through it every now and then. The terrible towel is a good idea. Maybe a little figurine of the incline or the Cathedral of Learning would be a nice memoir.
This may give you some ideas.