This Basilica looks nice on the outside, but inside it is absolutely breathtaking! Just look up, look around, it's all beautiful. I think they have tours sometimes, but you can just walk in if you're there at the right time. I would definitely recommend any musical events here to combine the ear candy with eye candy. You could attend Mass while you're here if you wanted, but you don't have to be Catholic to appreciate how beautiful this place is. Definitely stop by if you're in the South side of MKE.