I'm not Catholic and don't believe in organized religion, but this cathedral is one of my favorite places on the planet. Spent a lot of time meditating here this trip and praying. The best time to go is early in the morning before the tourists arrive in bus loads. Its hard to not have your breath taken away by this place. The beauty of the stained glass windows, especially the famous rose ones....well its hard to not doubt the existence of some God out there when you see it.