The Cathedral of Learning is a very beautifully designed building. It is one of the many gems of Pittsburgh. If you are new to the city and want to do something educational and make your visit worth-wild, I highly recommend checking out the Cathedral of Learning and tour the Nationality Room. It costs $4 for adults and $2 for children to tour the curated classrooms that are designed to display all sorts of cultures from all over the world. You can even explore on your own but you won't have access to all of the class rooms. They even design the rooms with holiday decorations during the winter holiday.
The highlight of the building is the main hall. It looks like the Great Hall at Hogwarts. It just looks so magical, majestic and historical.