Even if you visit no other Church in all of Montreal, this includes Notre Dame, visit this one. There, I said it. (Please don't burn me at the stake).
First off, the land that this place rests upon is huge. If you're driving, be sure to try and get a spot at the highest point possible. If you're walking, good luck. Contrary to prior reviews, parking was free for me (New Year's Special?). The parking lot attendant/traffic enforcer did not ask me for money and I saw no kiosk to pay for parking. Oh well! (Trust me, I more than made up for it at the gift shop).
So much beauty and history! I probably missed the guided tour, but roaming around this place with its multiple escalators was so fascinating to me. It's truly a "wow" experience if you stand at the highest point and look down.
I hope to attend Mass here one day; hope it's in English!