Super cool building - the lobby of the cathedral is fabulous, just look up and you'll be mesmerized! Lobby is being used as a study space by college students. The Nationality Rooms are on 1st and 3rd floors, but unlike a museum where you can see them at any time, the 28 rooms (other 2 are protected by glass) can only bee seen when college courses are not in session. That's right, those 28 rooms are actually active classrooms (our group only got a chance to see some of the rooms, cine most were occupied by classes, but we're definitely visiting this place again to see the rest of them). It's a really neat experience, seeing the classrooms (and artifacts) of different nations and how they were constructed (walls, tiles, ceilings) and the unique seating. We're definitely returning and highly recommend this place! Feels like this sacred place should be protected from the people, but it's a pretty active environment.