This cathedral is absolutely breathtaking. Just be aware of the folks who may be trying to tie something around your hand while you're taking photos outside to "bless" you or something like that -- it'll cost ya!
We went to the Empire State Building late at night (maybe 11 or 11:30). We walked down after we saw Jersey Boys. It was perfect because there were no lines....but you could see all the ropes for the queues, and they went on forever!!