Part of PITT, the CoL is the tallest landmark in Pittsburgh.
Basically, offices and study areas for Pitt students, it is however, open to the public, which is totally worthwhile.
The inside could easily have you believe that you are in Hogwarts. Tall stone pillars and columns, along with open Great Rooms (and appropriate wooden tables and benches) make you believe that Headless Harry or Moaning Myrtle will come swooping around the corner at any moment.
This building alone would have me filling out an application to the university.
Make time to stop by and visit, even if you only have a day. It's fantastic.