Basilique Notre-Dame-de-Montreal. This was one of the highlights of my trip. This basilica was designed by O'Donnell, a protestant architect who was so pleased with his handiwork that he became catholic. The neo-Romaneseque interior is complete with a blue vaulted ceiling studded with thousands of 24-karat gold stars. I walked in to the stirrings of a high school choir rehearsal, and just sat there for almost 90 minutes just listening to them and soaking in the place.