The Cathedral of Learning, located on the U of Pitt campus, is the second tallest educational/gothic building in the world (& tallest in the western hemisphere) and is well worth going out of your way for if you're staying in downtown Pittsburgh. From it's outside and the looks of the gothic interior, you would never guess that this is a place for study and learning. It feels and looks more like a place of worship. The University offers very cheap $4 audio tours of the first level of the "Nationality Rooms"-some 30+ classrooms-decorated in the flair of that particular country. The audio tour describes elements of each room. I found the heavily wooded interior of the German room and Chinese motifs in the Chinese room to be of the most interest. Loved the Czech room as well. There are two levels of nationality rooms and unfortunately didn't have time to see the second floor of rooms (which, by the ways, are free to tour) because of an afternoon ballgame at PNC Park that was slated to start. I would've definitely stayed longer. No need for a passport here! Tour the world in one morning and save a bundle of $$, miles and points! *sarcasm* Just gives me an excuse to go back is all.
Forbes Ave at Dithridge St
A number of bus routes connect the U of Pitt Campus & it's attractions to downtown Pittsburgh, such as the 61 and 28X buses. Very cheap way to get around.